Hydroponic Nutrients & Plant Feed

Shop hydroponic nutrients and plant feed for indoor growing across hydroponic systems, coco coir and soil. The SteelRoots range includes base grow and bloom nutrients, flowering boosters, root and growth additives, CalMag and nutrient supplements, organic fertilisers, enzymes, propagation nutrients, foliar feeds, mycorrhizal products and flushing and finishing formulas.

Choose from established plant nutrition brands including CANNA, Athena, Advanced Nutrients, BioBizz, SHOGUN, Plagron, Dutch Pro, VitaLink, Nutrifield, Growth Technology, Plant Magic, House & Garden and Growers Ark. The collection covers complete base-feeding programmes alongside specialist additives and supplements, making it easier to find plant nutrition for different growth stages, growing media and feeding systems.

Nutrient formulations, application methods and suitability vary between products. Check the individual product instructions when selecting nutrients for hydroponic, coco or soil growing, particularly when combining base nutrients with boosters, supplements or additives. For help working out nutrient quantities by reservoir size and growth stage, use the SteelRoots Hydroponic Nutrient Calculator.

  • Athena Blended CaMg 946 mL, 3.8 L and 18.9 L sizesAthena Blended Line CaMg | Calcium & Magnesium Supplement
    Athena Blended CaMg 946 mL, 3.8 L and 18.9 L sizesAthena Blended Line CaMg | Calcium & Magnesium Supplement
    A white plastic 1 gallon jug of Athena CaMg blended calcium magnesium and iron supplement with a blue and white labelAthena Blended Line CaMg | Calcium & Magnesium Supplement
    A white plastic 5 gallon jerrycan-style container of Athena CaMg Calcium Magnesium & Iron Supplement, featuring a white and blue label with bold black text.Athena Blended Line CaMg | Calcium & Magnesium Supplement
    Athena

    Athena Blended Line CaMg | Calcium & Magnesium Supplement

    £20.95
    £20.95

    Athena Blended CaMg – Calcium & Magnesium Supplement Athena Blended CaMg is a concentrated liquid calcium and magnesium supplement designed to complement Athena's two-part liquid nutrient...

    Size: 1 QT
  • Athena Pro Mix Kit | Core, Grow & Bloom Nutrient Starter KitAthena Pro Mix Kit | Core, Grow & Bloom Nutrient Starter Kit
    Athena Pro Mix Kit | Core, Grow & Bloom Nutrient Starter Kit
    Save £20.00
    Athena

    Athena Pro Mix Kit | Core, Grow & Bloom Nutrient Starter Kit

    £99.95
    £99.95 £119.95

    Athena Pro Mix Kit – Core, Grow & Bloom Concentrate Mixing Kit Athena Pro Mix Kit is an all-in-one starter kit for growers looking to use...
  • Two white plastic jugs of Athena Stack Foliar Bloom Enhancer 0-0-1 liquid fertilizer, one 5-gallon container and one 1-gallon container, shown on a white background.A man in a gray hoodie and black cap holds a large white jerrycan of Athena Stack Bloom Enhancer. The background shows a sophisticated greenhouse automation system with tanks, pipes, and digital pH monitors.
    Two white plastic jugs of Athena Stack Foliar Bloom Enhancer 0-0-1 liquid fertilizer, one 5-gallon container and one 1-gallon container, shown on a white background.A man in a gray hoodie and black cap holds a large white jerrycan of Athena Stack Bloom Enhancer. The background shows a sophisticated greenhouse automation system with tanks, pipes, and digital pH monitors.
    A white plastic 1 gallon jug of Athena Stack 0-0-1 Bloom Enhancer with a prominent green label and black text, set against a plain white background.A man in a gray hoodie and black cap holds a large white jerrycan of Athena Stack Bloom Enhancer. The background shows a sophisticated greenhouse automation system with tanks, pipes, and digital pH monitors.
    Save £18.04
    Athena

    Athena Stack 0-0-1 | Kelp Plant Nutrient & Bloom Enhancer

    £89.95
    £89.95 £107.99

    Athena Stack 0-0-1 – Kelp Plant Nutrient & Bloom Enhancer Athena Stack is a premium kelp-extract plant nutrient developed to support healthy plant growth, transition and...

    Size: 1 QT
  • HY-GEN Bud Link Silica & Micronutrient Booster | High-Solubility Bio-Available Silicon Additive – Strengthens Stems & Enhances Weight for Hydroponic & Coco GardeningHY-GEN Bud Link Silica & Micronutrient Booster | High-Solubility Bio-Available Silicon Additive – Strengthens Stems & Enhances Weight for Hydroponic & Coco Gardening
    HY-GEN Bud Link Silica & Micronutrient Booster | High-Solubility Bio-Available Silicon Additive – Strengthens Stems & Enhances Weight for Hydroponic & Coco Gardening
    HY-GEN Bud Link Silica & Micronutrient Booster | High-Solubility Bio-Available Silicon Additive – Strengthens Stems & Enhances Weight for Hydroponic & Coco Gardening
    HY-GEN

    HY-GEN Bud Link Silica & Micronutrient Booster | High-Solubility Bio-Available Silicon Additive – Strengthens Stems & Enhances Weight for Hydroponic & Coco Gardening

    £19.99
    £19.99

    HY-GEN BudLink: The Original Silicon Supplement for Stronger Plants BudLink is a premium liquid silicon additive trusted by professional growers worldwide for decades. Formulated with highly...

    Size: 1LTR
  • CANNA Silica 250ml and 1L plant nutrient supplement bottles with 5% SiO2 and nanotechnology formulaHobby grower measuring CANNA Silica into a 250ml jug beside a 250L hydroponic reservoir
    CANNA Silica 250ml and 1L plant nutrient supplement bottles with 5% SiO2 and nanotechnology formulaHobby grower measuring CANNA Silica into a 250ml jug beside a 250L hydroponic reservoir
    CANNA Silica 1L plant nutrient supplement with 5% SiO2 and nanotechnology formulaHobby grower measuring CANNA Silica into a 250ml jug beside a 250L hydroponic reservoir
    CANNA

    CANNA Silica | Premium Silicon Fertilizer for Plants

    £8.95
    £8.95

    Boost your crop’s natural defences with CANNA Silica, a premium silicon plant fertilizer engineered to build thick stems, rigid leaves, and unmatched environmental resilience. This professional-grade...

    Size: 250 ML
  • Bottle of ROOT!T rooting gel on a white backgroundROOT!T Rooting Gel 150ml | Premium Plant Cloning & Cutting Compound
    Bottle of ROOT!T rooting gel on a white backgroundROOT!T Rooting Gel 150ml | Premium Plant Cloning & Cutting Compound
    ROOT!T

    ROOT!T Rooting Gel 150ml | Premium Plant Cloning & Cutting Compound

    £4.99
    £4.99

    The ROOT!T Rooting Gel 150ml is a high-performance propagation compound formulated to accelerate root development on softwood and semi-hardwood plant cuttings. Replacing traditional hormone powders, this...
  • Dr Schimmel Organic Spider Mite Terminator | Natural Pest ControlDr Schimmel Organic Spider Mite Terminator | Natural Pest Control
    Dr Schimmel Organic Spider Mite Terminator | Natural Pest Control
    Dr Schimmel

    Dr Schimmel Organic Spider Mite Terminator | Natural Pest Control

    £14.99
    £14.99

    Dr Schimmel Organic Spider Mite Terminator Protect your canopy and eradicate persistent pests with Dr Schimmel Organic Spider Mite Terminator. This premium, 100% organic insecticide delivers...

    size: 25ml
  • Athena Pro Grow 2-8-20 vegetative fertiliser size rangeAthena Pro Grow 2-8-20 soluble vegetative fertiliser being mixed into a stock solution by SteelRoots
    Athena Pro Grow 2-8-20 vegetative fertiliser size rangeAthena Pro Grow 2-8-20 soluble vegetative fertiliser being mixed into a stock solution by SteelRoots
    Athena Pro Grow 2-8-20 soluble vegetative fertiliser 5 lb 2.26 kg bagAthena Pro Grow 2-8-20 soluble vegetative fertiliser being mixed into a stock solution by SteelRoots
    Athena Pro Grow 2-8-20 soluble vegetative fertiliser 10 lb 4.54 kg boxAthena Pro Grow 2-8-20 soluble vegetative fertiliser being mixed into a stock solution by SteelRoots
    Athena Pro Grow 2-8-20 soluble vegetative fertiliser 25 lb 11.34 kg bagAthena Pro Grow 2-8-20 soluble vegetative fertiliser being mixed into a stock solution by SteelRoots
    Save £15.55
    Athena

    Athena Pro Grow 2-8-20 Soluble Vegetative Fertiliser

    £21.95
    £21.95 £37.50
    £24.39 kg

    Athena Pro Grow 2-8-20 – Professional Soluble Vegetative Fertiliser Athena Pro Grow is a fully water-soluble dry mineral fertiliser developed specifically for the vegetative growth stage....

    sizes: 2 Lb | 900g
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