4/20 SALE! GET UP TO 20% OFF STOREWIDE UNTIL 4/26!

Nutrients

184 products


  • Earth Juice Hi-Brix MFP, 1 gal Hydro Organics / Earth Juice

    Earth Juice Hi-Brix MFP

    This rare and highly prized molasses is a natural source of carbohydrates (sugars) and plant nutrients that has been specially tailored into liquid formulation for indoor and outdoor plants in soil and hydroponics. It can be used in conjunction with a variety of fertilizers, and is highly recommended for the brewing of plant teas. A natural source of carbohydrates (sugars) and plant nutrients that has been specially tailored into liquid formulation for indoor and outdoor plants in soil and hydroponics Can be used in conjunction with a variety of fertilizers Highly recommended for the brewing of plant teas

    $12.64 - $89.46

  • Sale -24% Earth Shine Soil Booster with Biochar, 2 lbs. - A Hydrofarm Exclusive! GreenGro

    Earth Shine Soil Booster with Biochar A Hydrofarm Exclusive!

    Earth Shine All-In-One Natural Soil Booster - A Hydrofarm Exclusive! Earth Shine Soil Additive is a sustainable way to enhance your garden's natural biological processes. Increases soil carbon levels Supports microbial development Trace and essential minerals Fortfied with humic acid & worm castings

    $28.87 - $106.70

  • Sale -53% Elite Nutrients - Root Igniter Hydroponic Center Elite Nutrients 8OZ

    Elite Nutrients - Root Igniter

    Elite Root Igniter (Mycorrhizae) The beginning stages of plant growth are the most critical. Elite Root Igniter is used to bolster root structure and improve nutrient uptake. How it works: Engineered to perform, Elite Root Igniter is specifically formulated to increase root mass. Like the foundation of a house, a root mass that is thicker and spread evenly will provide stronger support. This translates to lower stress levels on the plant and more effective absorption of both water and beneficial nutrients. Simply put, more root mass is better! This formulation is a state-of-the-art liquid mycorrhizal inoculant. Mycorrhizae, a species of beneficial fungi, are scientifically proven to increase root mass, and lessen the damaging impacts of medium toxicity. Instructions: Use 3ml-5ml of solution per gallon of water to encourage root development during the Vegetation and Bloom cycle (see feed chart for further details).The Elite Difference:• Optimally Balanced: Nutrients are in their most plant-friendly form and are balanced to maintain an optimal pH, resulting in faster, maximized uptake and quicker absorption• Long Lasting: Superior product stability means longer shelf life• All Natural: Free of hormones, perfumes, dyes, and growth regulators, including paclobutrazol and daminozide.

    $15.46 - $463.62

  • Sale -55% Elite Nutrients - Root Tonic C Hydroponic Center Elite Nutrients 1 QT

    Elite Nutrients - Root Tonic C

    Elite Root Tonic C (0-10-12) may be used as a soil conditioner or directly to stimulate plant health and wellness during the vegetative stages of growth and throughout the plant’s lifecycle. How it works: Elite Root Tonic C has been biochemically engineered to assist in the development of stronger, healthier plants. Similar to electrolyte drinks that keep athletes going strong, Elite Root Tonic C provides an optimized liquid concentrate that quenches a growing plant's boundless thirst, creating lateral growth and a strong foundation. Instructions: Use 2 ml-4 ml of solution per gallon of water during the Vegetation and Bloom cycle (see feed chart for further details). The Elite Difference: • Optimally Balanced: Nutrients are in their most plant-friendly form and are balanced to maintain an optimal pH, resulting in faster, maximized uptake and quicker absorption• Long Lasting: Superior product stability means longer shelf life• All Natural: Free of hormones, perfumes, dyes, and growth regulators, including paclobutrazol and daminozide

    $32.66 - $457.52

  • Sale -30% Emerald Triangle Killer Tea, 2.5 gal Emerald Triangle

    Emerald Triangle Killer Tea

    Made from pure worm castings and the highest quality potent seabird and bat guanos. The species of worm is critical for a high potency casting and the best by far is derived from African worms. No product on the market compares. Long shelf life, no need to aerate and NO DISGUSTING SMELL. Use as is or add molasses and aerate to make an extremely potent bloom finishing tea. GREAT for flushing. Highly concentrated and all natural—over 2 years spent sourcing and testing ingredients in order to get it just right. NOT JUST ANOTHER TEA!!!!!   This product is also available in 15 gallon, 30 gallon, and 55 gallon drums.   Made from pure worm castings and the highest quality potent seabird and bat guanos Makes an extremely potent bloom finishing tea Long shelf life, but no need to aerate and no disgusting smell

    $60.61 - $103.34

  • Sale -15% FoxFarm Beastie Bloomz Hydroponic Center FoxFarm 6oz

    FoxFarm - Beastie Bloomz

    Beastie Bloomz® is perfect for gardeners and growers who are ready to take their plants to the next level. This is a high-phosphorus soluble fertilizer formulated to support blossom development during the middle to late weeks of the flowering cycle. Beastie Bloomz® is a high-phosphorus soluble fertilizer specially formulated to support blossom development during mid to late flowering.  For use in soilless mixes, soils, hydroponics, and aeroponic systems.Garden tip: Start with Open Sesame® in the fifth or sixth week of a plant’s life. Once buds emerge, feed your plants with Beastie Bloomz® every other watering according to package directions and FoxFarm's Feeding Schedule. In the eighth to ninth week of the plants life cycle, switch to Cha Ching®. Specially formulated to produce heavy weight fruit and maximize blossom development during the critical last weeks of flowering A pH-balanced blend of extra strength nutrients

    $17.91 - $137.17

  • Sale -0.2% FoxFarm Big Bloom Liquid Concentrate, 1 pt FoxFarm

    FoxFarm - Big Bloom Liquid Concentrate

    FoxFarm’s Big Bloom® Liquid Plant Food is a carefully selected blend of fertilizers formulated to support multiple blooms and seed formations. This liquid plant food supplies nutrients that your plants can access immediately. Big Bloom® contains bat guano and earthworm castings. Bat guano has been used for centuries as a fertilizer for all kinds of plants. Combined with earthworm castings they create a nutrient-rich mix that can help your plants thrive. Ideal for all flowering and fruiting plants and safe enough to use every time you water Big Bloom® will intensify flower fragrance, and it will increase essential oil production, which means stronger flavors in herbs, fruits, and vegetables

    $11.93 - $1,225.45

  • Sale -14% FoxFarm Bush Doctor Bembe Hydroponic Center FoxFarm 1gal

    FoxFarm - Bush Doctor Bembe

    From the deepest jungles of the African Congo comes the word “Bembé” which means Sweet Offering. This is a delicious treat for your plants that is extraordinarily fragrant and colorful.  Bush Doctor® Bembé® is a liquid concentrate that is precisely created with a complex array of sugars and nutrients. When used as directed, Bembé® can help plants achieve enhanced sweetness qualities, while providing a food source for the microbial populations at the root zone.  Enhances sweetness and flavors Contains solubilized organic nutrition Fast acting and easily absorbed by plants

    $23.90 - $63.98

  • Sale -10% FoxFarm Bush Doctor Boomerang Hydroponic Center FoxFarm 1 gal

    FoxFarm - Bush Doctor Boomerang

    Even Mother Nature needs a little help sometimes! Boomerang® lends a hand when the stresses of temperature fluctuations, unintentional neglect, and mineral salt build up knock your beauties down for the count. The soil microbes in Boomerang® help support the root zone. Boomerang® can also be used as a vegetative supplement. It contains solubilized nutrition that is immediately available to plants. Bush Doctor® Boomerang® is the “Comeback Formula” that gives your plants a fighting chance. Microbially-based formula Helps heal damaged root tissue while encouraging new root growth and internodal vegetative growth

    $24.34 - $85.20

  • Sale -43% FoxFarm Bush Doctor Flowers Kiss Hydroponic Center FoxFarm 1 gal

    FoxFarm - Bush Doctor Flowers Kiss

    BushDoctor Flowers Kiss 1.0-0.30-0.05 Bush Doctor® Flowers Kiss® is designed to be absorbed through the leaves, like a soft rain, providing nutrition from the top down.Survival of the fittest is a way of life in the rainforest. Layer upon layer of giants lift their foliage to the sky where sunlight, water and nutrients can be claimed. Bush Doctor® Flowers Kiss® spray-on foliar plant food is designed to be easily absorbed through stomata on the plant’s leaves, like a soft rain, providing nutrition from the top down. Flowers Kiss® supplements micronutrients that are crucial in the early flowering phase of plant growth to enhance flower development and encourage a bountiful yield. It helps to alleviate stress in the transitional period between vegetative growth and flowering. Isn’t it great that your plants don’t have to fight to survive?

    $15.44 - $74.73

  • Sale -3% FoxFarm Bush Doctor Kangaroots Hydroponic Center FoxFarm 1 qt

    FoxFarm - Bush Doctor Kangaroots

    Bush Doctor® Kangaroots® is a liquid root drench formulation for use on in-ground plantings, container gardens and hydroponic systems. Use on seedlings and mature plants to enhance the proliferation and root mass development of both primary and secondary roots.Kangaroots® also contains concentrated amounts of microbes designed for hosting not only directly on the roots, but in the soil around them. Kangaroots® supplies essential macro and micronutrients that plants thrive on for both hydroponic and soil applications. For optimal results, follow the FoxFarm feeding schedule. A liquid root drench formulation designed to enhance the proliferation or root mass development for both primary and secondary roots Contains nutrition specifically designed to be instantly available for roots to absorb at optimal levels Can be used in both hydroponic and soil applications

    $25.24 - $88.72

  • Sale -10% FoxFarm Bush Doctor Kelp Me Kelp You Hydroponic Center FoxFarm 1 pt

    FoxFarm - Bush Doctor Kelp Me Kelp You

    Kelp grows higher than even some of the Earth's trees. The teeming aquatic life that flourishes in a kelp bed has just as much diversity as that of a rainforest. Kelp Me Kelp You® is a seaweed extract derived from Ascophyllum nodosum and designed for use in organic gardening. FoxFarm's product is a liquid concentrate that can be used for growing fruits, vegetables, gardens or flowers. Suitable for use in gardens, drip-irrigation systems or hydroponic applications. OMRI Listed® and Registered CDFA Organic Input Material. Stimulates seed germination Promotes root growth Increases yields

    $25.25 - $58.78

  • Sale -6% FoxFarm Bush Doctor Microbe Brew Hydroponic Center FoxFarm 1 pt

    FoxFarm - Bush Doctor Microbe Brew

    Bush Doctor® Microbe Brew® is a liquid microbial inoculant with a complex blend of ingredients specially formulated to help plants achieve enhanced root efficiency and nutrient uptake.Microbe Brew® encourages rapid microbial colonization at the root zone and can be used in both hydroponic and soil applications.Use Microbe Brew® on your ornamental flowers, evergreens, vegetables and trees. For best results, follow the FoxFarm feeding schedule. A complex blend of ingredients specially formulated to help plants achieve optimum microbial habitats at the rhizosphere or root zone environment Contains concentrated amounts of fungi and bacteria spores that will inoculate large populations at a rapid pace Microbe Brew will satisfy your plant and your soil's thirst with the nutritional cocktail they deserve

    $15.94 - $85.61

  • FoxFarm Bush Doctor Sledge Hammer Hydroponic Center FoxFarm 1 gal

    FoxFarm - Bush Doctor Sledge Hammer

    Bush Doctor® Sledge Hammer® is a unique rinse formula designed to remove excess fertilizer build up and encourage water movement through soil and soilless mediums. High fertilizer use can compromise plant growth over time due to concentrated mineral salt deposits.Sledge Hammer® helps release surface tension in the soil which will allow for optimum absorption of moisture and nutrition throughout the plant’s root system. Derived from Saponin, an extract of the Yucca Schidigera plant. Sledge Hammer® is organic and can be used for both hydroponic and soil applications.For optimal results, follow the FoxFarm feeding schedule. A unique rinse formula designed to remove fertilizer buildup and encourage water movement through soil and soilless mediums Helps release surface tension in the soil which will allow for optimum absorption of moisture and nutrition throughout the plant's root system

    $25.30 - $80.75

  • Sale -34% FoxFarm Bush Doctor Wholly Mackerel Hydroponic Center FoxFarm 1 gal

    FoxFarm - Bush Doctor Wholly Mackerel

    Bush Doctor Wholly Mackerel® is a liquid plant nutrient derived from fish. Wholly Mackerel® provides immediately available nutrition to support vigorous growth. Use as a root drench application. Registered CDFA Organic Input Material. Easy application No fishy smell Slow-release nitrogen

    $11.18 - $63.65

  • Sale -15% FoxFarm Cha Ching Hydroponic Center FoxFarm 15 lb

    FoxFarm - Cha Ching

    FoxFarm engineered Cha Ching® to maximize a plant's production. Every stage of the growing cycle demands optimal nutrition. Cha Ching® is a high-phosphorus fertilizer that won't leave a salty residue or build up in the soil. Even better, we've included the micronutrient pack that FoxFarm is known for. It contains all the essential elements you need to support juicy fruit on compact, stocky plants. Cha Ching® creates juicy, robust fruit with essential oils and resins pumping out of stems and leaves. That means concentrated flavor and perfect texture. After flowers are fully formed, switch to Cha Ching® and continue through harvest. Feed with every other watering (this is a late flowering formula).

    $17.91 - $164.98

  • Sale -15% FoxFarm - Open Sesame Hydroponic Center FoxFarm 6 OZ

    FoxFarm - Open Sesame

    **DUE TO SHIPPING RESTRICTIONS WE ARE UNABLE TO SHIP TO THE FOLLOWING LOCATION: SOUTH DAKOTA** Open Sesame is a blend of nutrients specifically designed for use during the early weeks of flowering. Open Sesame supports vigorous flowering and bud development. Use in soilless mixes, soils, hydroponics and aeroponic systems. Open Sesame is a high-phosphorus soluble fertilizer that’s designed for use during the early weeks of flowering to support vigorous blooming and bud development.Garden Tip: Feed with Open Sesame every other watering, starting at about the fifth or sixth week of a plant’s life. 

    $17.90 - $175.29

  • Sale -16% FoxFarm Soluble 1 lb Trio Pack FoxFarm

    FoxFarm - Soluble 1 lb Trio Pack

    A trio of high-octane fertilizers: Open Sesame, Beastie Bloomz and Cha Ching. Achieve bumper crop harvests by utilizing all three soluble products at first bud development. Begin feeding with Open Sesame for early flowering, Beastie Bloomz for bud density during mid-flowering, and finish with Cha Ching for essential oils and to pump out heavy resins.  For best results please refer to the FoxFarm Feeding Schedule. A trio of FoxFarm's high-octane fertilizers—Open Sesame, Beastie Bloomz, and Cha Ching Soluble All three work together as part of a sequential feeding schedule for hydroponic and conventional gardeners

    $134.95$113.36

  • Sale -2% FoxFarm - Tiger Bloom - Liquid Concentrate Hydroponic Center FoxFarm 1 pt

    FoxFarm - Tiger Bloom - Liquid Concentrate

    FoxFarm Tiger Bloom is a phosphorus fertilizer that contains nitrogen to support vigorous growth. It is formulated with a low pH to maintain stability in storage and keep micronutrients available. Tiger Bloom can be used for both hydroponic and soil applications.  Tiger Bloom is designed to encourage abundant fruit, flower, and multiple bud development. Use Tiger Bloom at the first signs of flowering through harvest.

    $13.69 - $2,042.44

  • FoxFarm Bush Doctor® Cal-Mag, 1 pt Hydroponic Center FoxFarm 1 pt

    FoxFarm Bush Doctor® Cal-Mag, 1 pt

    FoxFarm Bush Doctor® Cal-Mag Product Details BUSH DOCTOR CAL-MAG Cal-Mag Supplement1 - 0 - 0, 3% Calcium 0.9% Magnesium Nobody likes blossom end rot or tip burn. That’s why FoxFarm brings you BUSH DOCTOR CAL-MAG. Calcium and magnesium help strengthen cell walls and aid in fruit development, helping you avoid the costly and frustrating deficiencies that cause these problems. OMRI Listed and CDFA Registered for Organic Gardening.   SHIPMENT RESTRICTIONS: Due to state restrictions, we are unable to ship this product to the following locations: NORTH CAROLINA, OREGON, PUERTO RICO   

    $12.66 - $60.36

  • Sale -50% FoxFarm Cultivation Nation® pH UP Hydroponic Center FoxFarm 1 pt

    FoxFarm Cultivation Nation® pH UP

    FoxFarm Cultivation Nation® pH UP   Product Details HOW TO USE: Cultivation Nation pH UP raises the pH of nutrient solutions. An ideal pH range for growing plants is 5.6 – 6.8.  Shake well before use.Take a pH reading of the nutrient solution. Based on your pH reading, adjust the pH by adding small amounts of pH UP at a time, testing for pH again after each application. Continue until the desired pH is reached. CAUTION: Contains potassium hydroxide. Only add pH UP directly to water or nutrient solution. See product label for detailed precautionary and first aid information.     Shipment Restrictions Due to state restrictions, we are unable to ship this product to the following location(s): NORTH CAROLINA, PUERTO RICO 

    $59.75 - $151.34

  • Sale -27% G10 Gravitation #10, 1 gal Hydroponic Center Emerald Triangle 1 qt

    G10 Gravitation #10

    G10 (Gravitation #10) started as Emerald Triangle's experimental substitute for Gravity but turned into something else. They have taken their original proprietary kelp extract to the next level. It's not Gravity—it's something MORE! Use with Sonic Bloom and Killer Tea for maximum finish.

    $139.40 - $292.25

  • Sale -10% Gaia Green Basalt Rock Dust Hydroponic Center Gaia Green

    Gaia Green Basalt Rock Dust

    Gaia Green Basalt Rock Dust   GAIA GREEN Basalt Rock Dust is mined from an ancient volcanic deposit in British Columbia, Canada. It is a source of natural minerals and trace elements that plants need to thrive. This product can be used on farms, home gardens, landscapes and turf, for a full range of plant types.   SDS - Gaia Green Basalt Rock Dust 2019    Due to certain restrictions, we are unable to ship this product to the following location(s): FLORIDA PUERTO RICO

    $13.99$12.61

  • Sale -10% Gaia Green Glacial Rock Dust Hydroponic Center Gaia Green 500g

    Gaia Green Glacial Rock Dust

    Gaia Green Glacial Rock Dust   Product Details Gaia Green Glacial Rock Dust Glacial Rock Dust is sourced from mineral deposits left by moving glaciers during the last ice age. This natural fertilizer contains essential plant nutrients that support strong plant growth and can be used on all plants in home gardens, landscapes, lawn, and turf. Glacial Rock Dust can also be added to compost piles to help optimize nutrient conditions for root growth and overall plant development.Benefits: Finely ground rock dust from glacial moraine helps to re-mineralize soil. An excellent source of magnesium, iron, manganese and trace elements. Helps improve soil structure, moisture retention, drainage, and cation exchange capacity. Provides essential plant minerals that enhances vitality. Enriches compost with valuable trace elements.

    $11.70 - $13.24

  • Sale -13% Gaia Green Super Fly Hydroponic Center Gaia Green 750 g

    Gaia Green Super Fly

    Gaia Green Super Fly GAIA GREEN Super Fly    Insect Frass is a fertilizer derived from the excreta of black soldier fly larvae. It is a renewable resource produced from pre-consumer food waste fed to fly larvae. Though new to growers, this digested material has played a significant role in plant nutrition for millions of years. Gaia Green Super Fly Insect Frass is rich in essential nutrients. SDS - Gaia Green Organics Super Fly Insect Frass 2021    Due to certain restrictions, we are unable to ship this product to the following location(s): FLORDIA, PUERTO RICO

    $13.03 - $35.24

  • Sale -19% Gaia Mania, 1 qt Nectar for the Gods

    Gaia Mania

    Gaia Mania is one of Oregon's Only Organics' original products, and was designed to work as a standalone nutrient for home gardeners. This product has been around for many years, under many labels, and has now found its home as Gaia Mania. Gaia Mania is a careful blend of organic materials, enzymatically processed to extract only proteins and humates. This digestion process is the beginning step in the absorption of vitamins, acids and minerals by the plant. Gaia Mania has the ability to feed plants immediately, and is also designed to promote microbial populations in your medium, offering greater protection to plants' root systems. All of the nitrogen in this product is protein based. This is the healthiest form of nitrogen for plants, promoting strong, healthy growth without a tendency toward elongation as with sodium based nitrates. Plants grow healthiest when they are grown with proteins, organic acids, and calcium based products. Addition of calcium will improve the uptake of Gaia Mania.

    $14.58 - $120.90

  • Sale -25% GroStar EC Calibration Kit (2.77 EC, 8 oz. each) Hydroponic Center GroStar

    GroStar EC Calibration Kit (2.77 EC, 8 oz. each)

    GroStar EC Calibration Kit (2.77 EC, 8 oz. each) Product Details GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) 2.77 EC conductivity standard calibration solution Used as a reference or checking solution to ensure you have adequately cleaned the EC/ppm probe Calibration Solution should be stored in a cool place out of direct sun and heat. Non-hazardous product Please keep out of reach of children  Made in USA

    $14.99$11.24

  • Sale -26% GroStar GS1 pH Pen Hydroponic Center GroStar

    GroStar GS1 pH Pen

    GroStar GS1 pH Pen Product Details AI11010 - GroStar GS1 pH Pen Lab grade instruments designed specifically for growers! Includes: pH 7 & pH4 calibration solution (50ml bottle each), KCL storage solution (10ml bottle), lanyard and user manual Measures pH and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Easy-to-use design and fast calibration adjustment Double junction replaceable probe, so you don’t have to discard the entire pen when the probe reaches its end of life Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe

    $115.99$85.89

  • Sale -28% GroStar GS1-E replacement pH electrode Hydroponic Center GroStar

    GroStar GS1-E replacement pH electrode

    GroStar GS1-E replacement pH electrode Product Details AI58010 - GroStar GS1-E replacement pH electrode Replacement GS1 probe measures pH and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Low-resistance lithium glass membrane Double junction structure uses blue gel electrolyte without the air bubble 1-year warranty

    $50.99$36.71

  • Sale -30% GroStar GS2 Soil pH Pen Hydroponic Center GroStar

    GroStar GS2 Soil pH Pen

    GroStar GS2 Soil pH Pen   Product Details AI31020 - GroStar GS2 Soil pH Pen Lab grade instruments designed specifically for growers! Includes: pH 7 &  pH 4 solution (50ml bottles of each), KCL soaking solution (10ml bottle), cleaning brush, hole dibber, lanyard and user manual Measures pH and temperature in nutrient solution, soil, coco coir, rockwool, and many other media types Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Impact-resistant spear glass tip, 10 times stronger than conventional glass bulb PTFE ring prevents a clogged junction caused by soil particles, significantly increases durability Backed by Apera's proprietary sensor technology from Switzerland Easy-to-use design and fast calibration adjustment Replaceable Swiss LabSen Spear Soil pH Probe Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe

    $256.99$178.86

  • Sale -30% GroStar GS2-E replacement Soil Spear pH electrode Hydroponic Center GroStar

    GroStar GS2-E replacement Soil Spear pH electrode

    GroStar GS2-E replacement Soil Spear pH electrode Product Details AI58020 - GroStar GS2-E replacement Soil Spear pH electrode Spear pH Probe measures pH and temperature in nutrient solution, soil, coco coir, rockwool, and many other media types Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Impact-resistant spear glass tip, 10 times stronger than conventional glass bulb PTFE ring prevents a clogged junction caused by soil particles, significantly increases durability Backed by Apera's Swiss LabSen proprietary sensor technology 1-year warranty

    $181.99$126.66

  • Sale -29% GroStar GS3 EC Pen Hydroponic Center GroStar

    GroStar GS3 EC Pen

    GroStar GS3 EC Pen Product Details AI11030 - GroStar GS3 EC/PPM/Temp Pen Lab grade instruments designed specifically for growers! Includes: 2.77 EC calibration solution (50 ml bottle) Measures conductivity EC, PPM (500), PPM (700) and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Titanium alloy sensor designed for high accuracy EC measurement Easy-to-use design and fast calibration adjustment. Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Replaceable probe Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe

    $113.99$80.70

  • Sale -28% GroStar GS3-E replacement EC electrode Hydroponic Center GroStar

    GroStar GS3-E replacement EC electrode

    GroStar GS3-E replacement EC electrode Product Details AI58030 - GroStar GS3-E replacement EC electrode Measures conductivity EC, PPM (500), PPM (700) and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Titanium alloy sensor designed for high accuracy EC measurement 1-year warranty

    $53.99$38.87

  • Sale -30% GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen Hydroponic Center GroStar

    GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen

    GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen Product Details AI21040 - GroStar GS4 pH/EC/500ppm/700ppm & Temp (5-in-1) Combo Pen Lab grade instruments designed specifically for growers! Includes:  pH 7 & pH 4 calibration solution (50ml bottle each), 2.77 EC (50ml bottle) and KCL storage solution (10ml bottle), lanyard and user manual Measures pH, conductivity (EC and 500ppm/700ppm) and temperature (5-in-1) Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Easy-to-use design and fast calibration adjustment Double junction replaceable probe, so you don’t have to discard the entire pen when the probe reaches its end of life Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe Compatible with all Apera GroStar probes

    $178.99$124.57

  • Sale -28% GroStar GS4-E replacement pH/EC combo electrode Hydroponic Center GroStar

    GroStar GS4-E replacement pH/EC combo electrode

    GroStar GS4-E replacement pH/EC combo electrode Product Details AI58040 - GroStar GS4-E replacement pH/EC combo electrode Measures pH, conductivity (EC and PPM) and temperature Combo probe built with lithium glass membrane and titanium alloy to ensure high accuracy and durability Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Double junction structure uses blue gel electrolyte without the air bubble 1-year warranty

    $79.99$57.59

  • Sale -25% GroStar pH calibration kit (pH 4/7, 8 oz. each) Hydroponic Center GroStar

    GroStar pH calibration kit (pH 4/7, 8 oz. each)

    GroStar pH calibration kit (pH 4/7, 8 oz. each) Product Details GroStar by Apera pH calibration kit (pH 4/7, 8 oz. each) Kit includes:  (1) 8 oz. pH 4.0 calibration solution (1) 8 oz. pH 7.0 calibration solution  pH measuring equipment must be cleaned and calibrated regularly to ensure accurate readings. High accuracy (0. 01 pH): standardized against NIST Certified pH references within 0. 01 pH at 25˚C (77˚F). ideal for the calibration of all pH meters Color-coded, double-sealed, 1-year shelf life Expiration date and temperature/ph reference chart provided for reference Non-hazardous product Calibration Solution should be stored in a cool place out of direct sun and heat.

    $18.99$14.24

  • Sale -25% GroStar pH calibration kit (pH 4/7/10, 8 oz. each) Hydroponic Center GroStar

    GroStar pH calibration kit (pH 4/7/10, 8 oz. each)

    GroStar pH calibration kit (pH 4/7/10, 8 oz. each) Product Details GroStar by Apera pH calibration kit (pH 4/7/10, 8 oz. each) Kit Includes: (1) pH 4.0 calibration solution 8 oz. (1) pH 7.0 calibration solution 8 oz. (1) pH 10.0 calibration solution 8 oz. pH measuring equipment must be cleaned and calibrated regularly to ensure accurate readings High accuracy (0. 01 pH): standardized against NIST Certified pH references within 0. 01 pH at 25˚C (77˚F). ideal for the calibration of all pH meters Color-coded, double-sealed, 1-year shelf life Expiration date and temperature/ph reference chart provided for reference Non-hazardous product Calibration Solution should be stored in a cool place out of direct sun and heat

    $28.99$21.74

  • Sale -25% GroStar pH Probe Maintanence Kit Hydroponic Center GroStar

    GroStar pH Probe Maintanence Kit

    GroStar pH Probe Maintanence Kit Product Details All-in-one maintanence kit provides everything you need to maintain, clean and store your GroStar pH probe   Kit Includes:  3M KCL storage solution (4oz.) Cleaning solution (8oz.) CalPod solution organizer Probe cleaning brush Wash bottle

    $23.99$17.99

  • Sale -21% Grotek Green Line Synergy, 800 grams Grotek

    Grotek Green Line Synergy

    What is Synergy Synergy™ is a water-soluble powder that contains fungi that helps plants achieve explosive root development and overall growth all the way to harvest. Arbucular Mycorrhizal Fungi (AMF) stimulates growth and productivity in the majority of plants on our planet and they also directly help improve soil conditions.Key features: A mycorrhizae that works with fertilizers Industry leading colonization Directly impacts plant growth and yield A closer look:The variety of mycorrhizae found in Synergy™ is particularly effective in intensive agriculture when using fertilizers. Not all Mycorrhizae have constant positive results with crops. This is due to a lack of colonization, which can be impacted by the use of any fertilizer. This particular strain adapts to and tolerates saline (EC) environments found in intensive agriculture far better than glomus intraradices and glomus mosseae. Under these conditions, Synergy™ shines with rapid colonization and improved impact on plants and soil structures.Directions for use:Avoid contact with eyes, skin and clothing.Wash hands after use. Store in a cool, dark location with lid secured between uses. Transplant – Add 1g per 4L of potting soil. Apply 5 days after transplant. Mixing potting soil with Grotek Organics™ Black Pearl™ can increase benefits. Root Drench – Add 1g per 4L of potting soil. Apply every 10-14 days until harvest (ensures high contact as roots grow). When used outdoors in true soil, apply 1.5kg/acre (3kg/Ha) a few days after transplant and again 2-3 times during the growing season.Compatible with Grotek Organics™ Root Force™ for added impact. Be sure to mix well in solution. If solution sits in a reservoir agitation is required. Mixing just prior to use ensures best results.

    $43.55 - $147.61

  • Sale -48% Grotek Pro Silicate Hydroponic Center Grotek 1 L

    Grotek Pro Silicate

    Grotek Pro Silicate Product Details Pro-Silicate is a nutritional silicate additive containing potassium and silicon. It helps keep the plants upright, positioning the leaves correctly for maximum light exposure that ultimately leads to more food production because of a high rate of photosynthesis. Pro-Silicate helps the plant battle wilting and drought by acting as insulation against excess water loss at higher temperatures. This helps increase plant growth and prolongs bloom life.   Oversized  Okay for ground shipment, may incur additional charges based on product dimensions 

    $8.19 - $146.28

  • Grotek Rype Hydroponic Center Grotek 500 ml

    Grotek Rype

    Crop-producing plants use the last of their energy in preparation to bear fruit. For gardeners, this is the time of judgment for their hard work. Rype™ is designed to support a high-quality crop with the most flavorful yield possible. This formula directly impacts the plant and also acts as a microbial catalyst with various beneficial ingredients such as amino acids and carbohydrates. Provides nutrients for critical ripening phase Multiple carbohydrates for microbial food Plant proteins for explosive growth N-P-K: 3-0-0

    $41.48

  • Sale -16% Grow More Bio-Cozyme Biostimulant, 1 qt Grow More

    Grow More Bio-Cozyme Biostimulant

    A 100% organic biostimulant that enhances a plants ability to absorb and utilize nutrients. Derived from natural occurring cytokinins, hormones, enzymes, vitamins, amino acids and micronutrients. Works by enhancing the plants ability to control the movement of nutrients through the stem and leaves and augments the existing enzyme functions in the plant. Increases the synthesis of chlorophyll, stimulates cell division and lowers the activation energy required for reaction/completion at the cellular level.         

    $31.87$26.84

  • Sale -31% Grow More Mendocino Avalanche Hydroponic Center Grow More 1 qt

    Grow More Mendocino Avalanche

    Flower hardener specially developed and field tested in the Emerald Triangle of Humboldt, Mendocino and Trinity Counties in Northern California. Helps stimulate flower development in the final bloom stage, for an increase in the size and mass of flowers. Fortified with Norwegian kelp extract, which supplies organic carbon, amino acids and carbohydrates for use on most flowering plants, hydroponic plants, indoor, outdoor, grown in container or field grown plant. May be applied by itself or in combination with other fertilizer or nutrient product.

    $18.86 - $213.79

  • Sale -27% Grow More Mendocino Crystalizer 5-10-40, 25 lbs Grow More

    Grow More Mendocino Crystalizer 5-10-40, 25 lbs

    High quality potassium promoter, strong stem and quality bloom, N to K ratio ideal for full production cycle bloom finisher. Grow More's Mendocino Producer's Choice line of fertilizers are the most advanced powders we've ever created. They are 100% water soluble formulas containing a properly balanced mixture of all essential plant nutrients with quality-enhancing elements: calcium, magnesium, DTPA/EDDHA iron, carbohydrates, amino acids, and no artificial dyes or colorings. This Mendocino line provides highly efficient performance nutrients as a standalone base nutrient or as a vegetative and bloom stimulant. For use in soilless, hydroponic, organic soils, and coco coir systems. Special soluble non-acidifying sulfur provides increase in chlorophyll formation and availability of potassium. 

    $87.99$64.39

  • Sale -27% Grow More Mendocino Honey, 1 gal Grow More

    Grow More Mendocino Honey

    Natural organic honey plus Montmorillinite, a source of over 70 trace elements. A naturally sweet carbohydrate plus organic carbon to stimulate growth. When used in a hydroponic system, it supplies a valuable source of organic carbon & carbohydrates. Increases brix levels resulting in a sweeter taste and aroma. Recommended for plants grown in soil, soilless mixes or hydroponic systems.          Natural organic honey plus Montmorillinite Naturally sweet carbohydrate plus organic carbon to stimulate growth Increases brix levels resulting in a sweeter taste and aroma

    $23.61 - $105.29

  • Sale -53% Growth Science Organics Abundant-Sea, 2.5 gal Growth Science

    Growth Science Organics Abundant-Sea

    Macrocystis integrifolia, commonly known as Giant Pacific Kelp, is one of the fastest growing organisms on earth. It’s also one of the many secrets behind Abundant-Sea®. The more successful the vegetative stage, the more fruits and flowers your plant will be able to produce. Abundant-Sea® has been specifically designed to encourage this rapid growth during a plant’s vegetative stage with an impressive array of natural ingredients. It’s this extensive nutrient mix within Abundant-Sea® that helps plants to reach their full vegetative growth capacity.  Kelp products have been used in organic agriculture for generations. They offer a number of benefits to the soil and the plants. Kelp contain over 50 different minerals and in addition are full of different phytocompounds that benefit plant growth. When used as foliar, absorption into plant tissue is greatly increased and results can be noticed the next day or sooner! Free of PGR’s

    $18.75 - $388.21

  • Sale -66% Growth Science Organics Root Magic Hydroponic Center Growth Science 1 qt

    Growth Science Organics Root Magic

    There is a direct correlation between root vitality, your plant’s growth, and your final yield. A larger, more robust root system also means that every time you apply a nutrient you are getting more effective uptake and better use of your nutrient dollars. Growth Science Organics created Root Magic® by blending extracts from some of nature’s most successful performers. This blend of natural extracts gives Root Magic® its ability to encourage root development, giving plants a solid foundation for vigorous growth. Ascophyllum nodosum is a species of kelp that deals with stresses for a majority of its life. This means that this plant has evolved ways to deal with stress. When you apply Kelp to your plant’s roots, it not only increases your plants ability to deal with stress but also stimulates and encourages root growth. Aloe Vera and Yucca act as a source of saponins and other unique compounds to help displace water more evenly into your soil. Fulvic acid chelates and feeds soil biology, along with molasses

    $13.45 - $483.10

  • Sale -19% Hades Down Hydroponic Center Nectar for the Gods 1 qt

    Hades Down

    Hades Down is a pH adjusting liquid used to lower the pH of your nutrient solution. Hades Down chelates elements in the nutrient solution into stable, slow releasing forms which are easier for plants to absorb. Providing readily absorbed natural molecules, Hades Down has the ability to stimulate microorganisms and plant growth. This stimulation will directly affect increases in CO2 production, photosynthesis, beneficial microbes, and plant vigor and health. When mixing fertilizers in a reservoir, Hades Down will help prevent nutrient solution fall out.

    $17.01 - $167.88


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