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.

  • Plagron Sugar Royal 250 ml, 500 ml and 1 litre bottles alongside the 5 litre purple jerrycan on a white background.Plagron Sugar Royal 250 ml purple bottle with white cap on a white background
    Plagron Sugar Royal 250 ml, 500 ml and 1 litre bottles alongside the 5 litre purple jerrycan on a white background.Plagron Sugar Royal 250 ml purple bottle with white cap on a white background
    A 1-liter bottle of Plagron Universal Sugar Royal additive enhancer, featuring a purple label and white cap on a clean white background.Plagron Sugar Royal 250 ml purple bottle with white cap on a white background
    A 500 ml bottle of Plagron Universal Sugar Royal additive enhancer, featuring a purple and white label with a white cap, on a clean white background.Plagron Sugar Royal 250 ml purple bottle with white cap on a white background
    Plagron Sugar Royal 250 ml purple bottle with white cap on a white background
    Plagron

    Plagron Sugar Royal | Amino Acid Booster for Flavour & Aroma

    £25.00
    £25.00
    £100.00 l

    Plagron Sugar Royal – Amino Acid Booster for Flavour and Aroma Plagron Sugar Royal is a liquid plant booster designed to support the flavour and aroma...

    SIZE: 250 ML
  • Plagron Cocos A & B nutrient sets in 1L, 5L and 10L sizes for coco growingPlagron Cocos A & B 5L nutrients with 5L measuring jug in hydroponic mixing facility
    Plagron Cocos A & B nutrient sets in 1L, 5L and 10L sizes for coco growingPlagron Cocos A & B 5L nutrients with 5L measuring jug in hydroponic mixing facility
    Two purple plastic jugs of Plagron Coco basic nutrient, labeled 'cocos a.' and 'cocos b.', on a clean white background.Plagron Cocos A & B 5L nutrients with 5L measuring jug in hydroponic mixing facility
    Two purple plastic jugs of PLAGRON Cocos a. and b 10 litre set basic nutrient, 100% Coco, shown on a white background.Plagron Cocos A & B 5L nutrients with 5L measuring jug in hydroponic mixing facility
    Plagron

    Plagron Cocos A&B Set | Two-Part Coco Base Nutrient

    £12.95
    £12.95 £12.95
    £12.95 l

    Two-Part Base Nutrients for Coco Growing Plagron Cocos A&B is a concentrated, two-part mineral base nutrient developed for plants grown in buffered coco coir. The matched...

    Size: 1 LTR
  • Plagron Terra Bloom base nutrient in 1L and 5L sizesA woman in a garden pours red liquid from a purple and pink Plagron Terra Bloom bottle into a black bucket.
    Plagron Terra Bloom base nutrient in 1L and 5L sizesA woman in a garden pours red liquid from a purple and pink Plagron Terra Bloom bottle into a black bucket.
    Plagron Terra Bloom 5L base nutrient for flowering plantsA woman in a garden pours red liquid from a purple and pink Plagron Terra Bloom bottle into a black bucket.
    Plagron

    Plagron Terra Bloom | Flowering Base Nutrient for Soil

    £10.95
    £10.95
    £10.95 l

    Complete Flowering Nutrient for Soil Growing Plagron Terra Bloom is a complete mineral base nutrient for plants grown in soil and peat-based growing media during the...

    Size: 1 LTR
  • Plagron Pure Zym enzyme additive family range in 250ml, 500ml, 1L, 5L and 10L sizesPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron Pure Zym enzyme additive family range in 250ml, 500ml, 1L, 5L and 10L sizesPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron Pure Zym 500ml enzyme additive for hydroponic growingPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron Pure Zym 1L enzyme additive for hydroponic growingPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron Pure Zym 5L enzyme additive for hydroponic growingPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron Pure Zym 10L enzyme additive for hydroponic growingPlagron Pure Zym 250ml enzyme additive for hydroponic growing
    Plagron

    Plagron Pure Zym | Enzyme Soil Improver for Growing Media

    £4.75
    £4.75

    Plagron Pure Zym Enzyme Soil Improver Plagron Pure Zym is a liquid soil improver made with natural enzymes. It helps break down dead plant material in...

    SIZE: 250 ML
  • Plagron PK 13-14 additive range in 250ml, 500ml, 1L, 5L and 10L sizesPlagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    Plagron PK 13-14 additive range in 250ml, 500ml, 1L, 5L and 10L sizesPlagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    A 250ml bottle of Plagron Universal pk 13-14 additive fertilizer, featuring a purple label and a white cap, set against a plain white background.Plagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    A 500ml bottle of Plagron Universal pk 13-14 additive fertilizer, featuring a purple label and a white cap, set against a plain white background.Plagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    A 5 litre bottle of Plagron Universal pk 13-14 additive fertilizer, featuring a purple label and a white cap, set against a plain white background.Plagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    A 10 litre bottle of Plagron Universal pk 13-14 additive fertilizer, featuring a purple label and a white cap, set against a plain white background.Plagron PK 13-14 | Phosphorus & Potassium Flowering Booster
    Plagron

    Plagron PK 13-14 | Phosphorus & Potassium Flowering Booster

    £5.80
    £5.80
    £23.20 l

    Plagron PK 13-14 Flowering Booster Plagron PK 13-14 is a concentrated mineral fertiliser that adds phosphorus and potassium to a plant’s feeding programme during flowering and...

    SIZE: 250 ML
  • House & Garden Aqua Flakes A&B | Recirculating Hydroponic NutrientsHouse & Garden Aqua Flakes A&B | Recirculating Hydroponic Nutrients
    House & Garden Aqua Flakes A&B | Recirculating Hydroponic Nutrients
    House & Garden Aqua Flakes A&B | Recirculating Hydroponic Nutrients
    House & Garden

    House & Garden Aqua Flakes A&B | Recirculating Hydroponic Nutrients

    £14.00
    £14.00

    Two-part base nutrients for recirculating hydroponics House & Garden Aqua Flakes A&B is a two-part liquid base nutrient for plants grown in recirculating hydroponic systems. Designed...

    Size: 1L
  • Plagron Hydro Roots root additive family range in 250ml, 500ml, 1L and 5L sizesPlagron Hydro Roots 250ml root additive for hydroponic growing
    Plagron Hydro Roots root additive family range in 250ml, 500ml, 1L and 5L sizesPlagron Hydro Roots 250ml root additive for hydroponic growing
    Plagron Hydro Roots 1L root additive for hydroponic growingPlagron Hydro Roots 250ml root additive for hydroponic growing
    Plagron Hydro Roots 5L root additive for hydroponic growingPlagron Hydro Roots 250ml root additive for hydroponic growing
    Plagron

    Plagron Hydro Roots | Mineral Root Additive for Hydroponics

    £10.00
    £10.00
    £40.00 l

    Mineral Root Additive for Hydroponic Growing Plagron Hydro Roots is a mineral root additive developed for hydroponic systems. Its phosphorus and boron content supports root development...

    size: 250 ML
  • All sizes of Athena Fade Enhancing Finisher with a white cap and a blue and white label, shown on a clean white background.Athena Fade 5 Gallon finishing nutrient being measured in a professional nutrient mixing facility
    All sizes of Athena Fade Enhancing Finisher with a white cap and a blue and white label, shown on a clean white background.Athena Fade 5 Gallon finishing nutrient being measured in a professional nutrient mixing facility
    1 Gallon jug of Athena Fade Enhancing Finisher with a blue and white label, shown on a clean white background.Athena Fade 5 Gallon finishing nutrient being measured in a professional nutrient mixing facility
    5 Gallon jerry can of Athena Fade Enhancing Finisher, featuring a white label with black 'Fade' text and a blue band at the bottom.Athena Fade 5 Gallon finishing nutrient being measured in a professional nutrient mixing facility
    Athena

    Athena Fade – Nitrogen-Free Finishing Flush & Ripening Enhancer

    £17.99
    £17.99

    Athena Fade – Nitrogen-Free Finishing Flush for the Final Flowering Stage Athena Fade is a specialist nitrogen-free finishing formula designed for the final stages of the...

    size: 1 QT
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