Additives
At The Greenhouse Effect we stock a large selection of additives and nutrients for hydroponic gardening.
If you need any help please call us on 01908 585 283, our highly knowledgeable staff will be happy to assist you.
RAW Yucca
Original price was: £31.99 – £1,597.99Price range: £31.99 through £1,597.99. Price range: £28.79 through £1,438.19Current price is: £28.79 – £1,438.19Price range: £28.79 through £1,438.19.
Select options
This product has multiple variants. The options may be chosen on the product page
DynoMyco Spark 3 in 1 Powder
Original price was: £24.99 – £1,199.99Price range: £24.99 through £1,199.99. Price range: £22.49 through £1,079.99Current price is: £22.49 – £1,079.99Price range: £22.49 through £1,079.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Dutchpro Explode
Original price was: £29.99 – £1,099.99Price range: £29.99 through £1,099.99. Price range: £26.99 through £989.99Current price is: £26.99 – £989.99Price range: £26.99 through £989.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Future Harvest Ton O Bud
Original price was: £24.99 – £899.99Price range: £24.99 through £899.99. Price range: £22.49 through £809.99Current price is: £22.49 – £809.99Price range: £22.49 through £809.99.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Grow Microbes
Original price was: £14.99 – £894.99Price range: £14.99 through £894.99. Price range: £13.49 through £805.49Current price is: £13.49 – £805.49Price range: £13.49 through £805.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Veg + Bloom Shine
Original price was: £38.99 – £849.99Price range: £38.99 through £849.99. Price range: £35.09 through £764.99Current price is: £35.09 – £764.99Price range: £35.09 through £764.99.
Select options
This product has multiple variants. The options may be chosen on the product page
DynoMyco Premium Mycorrhizal Inoculant Granules
Original price was: £15.99 – £799.99Price range: £15.99 through £799.99. Price range: £14.39 through £719.99Current price is: £14.39 – £719.99Price range: £14.39 through £719.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Rock Resinator
Original price was: £66.99 – £799.99Price range: £66.99 through £799.99. Price range: £60.29 through £719.99Current price is: £60.29 – £719.99Price range: £60.29 through £719.99.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Amino Acid(Tech Grade)
Original price was: £24.99 – £755.99Price range: £24.99 through £755.99. Price range: £24.99 through £680.39Current price is: £24.99 – £680.39Price range: £24.99 through £680.39.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Silica
Original price was: £16.99 – £739.99Price range: £16.99 through £739.99. Price range: £15.29 through £665.99Current price is: £15.29 – £665.99Price range: £15.29 through £665.99.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Enzymes (Tech Grade)
Original price was: £31.99 – £724.99Price range: £31.99 through £724.99. Price range: £28.79 through £652.49Current price is: £28.79 – £652.49Price range: £28.79 through £652.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Veg + Bloom Stax
Original price was: £41.99 – £714.99Price range: £41.99 through £714.99. Price range: £37.79 through £603.89Current price is: £37.79 – £603.89Price range: £37.79 through £603.89.
Select options
This product has multiple variants. The options may be chosen on the product page
Mills Vitalize
Original price was: £27.99 – £629.99Price range: £27.99 through £629.99. Price range: £25.19 through £566.99Current price is: £25.19 – £566.99Price range: £25.19 through £566.99.
Select options
This product has multiple variants. The options may be chosen on the product page
FloraMax Resin-XS
Original price was: £50.99 – £627.99Price range: £50.99 through £627.99. Price range: £45.89 through £565.19Current price is: £45.89 – £565.19Price range: £45.89 through £565.19.
Select options
This product has multiple variants. The options may be chosen on the product page
House and Garden Roots Excelurator
Original price was: £39.99 – £579.99Price range: £39.99 through £579.99. Price range: £35.99 through £521.99Current price is: £35.99 – £521.99Price range: £35.99 through £521.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Atami Rokzbastic
Original price was: £55.99 – £549.99Price range: £55.99 through £549.99. Price range: £50.39 through £494.99Current price is: £50.39 – £494.99Price range: £50.39 through £494.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Superthrive
Original price was: £12.99 – £549.99Price range: £12.99 through £549.99. Price range: £11.69 through £494.99Current price is: £11.69 – £494.99Price range: £11.69 through £494.99.
Select options
This product has multiple variants. The options may be chosen on the product page
FloraMax OrganaBud
Original price was: £38.99 – £544.99Price range: £38.99 through £544.99. Price range: £35.09 through £490.49Current price is: £35.09 – £490.49Price range: £35.09 through £490.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Bio Green X-Force Silicium
Original price was: £44.99 – £544.99Price range: £44.99 through £544.99. Price range: £44.99 through £490.49Current price is: £44.99 – £490.49Price range: £44.99 through £490.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Shogun Katana Roots
Original price was: £11.99 – £499.99Price range: £11.99 through £499.99. Price range: £10.79 through £449.99Current price is: £10.79 – £449.99Price range: £10.79 through £449.99.
Select options
This product has multiple variants. The options may be chosen on the product page
FloraMax Root-XS Root Stimulator
Original price was: £35.99 – £486.99Price range: £35.99 through £486.99. Price range: £32.39 through £438.29Current price is: £32.39 – £438.29Price range: £32.39 through £438.29.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Cane Molasses
Original price was: £13.99 – £484.99Price range: £13.99 through £484.99. Price range: £12.59 through £436.49Current price is: £12.59 – £436.49Price range: £12.59 through £436.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Field Marshal Flower Bomb
Original price was: £106.99 – £474.99Price range: £106.99 through £474.99. Price range: £96.29 through £427.49Current price is: £96.29 – £427.49Price range: £96.29 through £427.49.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Bloom Microbes
Original price was: £14.99 – £472.99Price range: £14.99 through £472.99. Price range: £13.49 through £425.69Current price is: £13.49 – £425.69Price range: £13.49 through £425.69.
Select options
This product has multiple variants. The options may be chosen on the product page
Atami Bloombastic
Original price was: £46.99 – £449.99Price range: £46.99 through £449.99. Price range: £42.29 through £404.99Current price is: £42.29 – £404.99Price range: £42.29 through £404.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Emerald Harvest Honey Chome
Original price was: £34.99 – £445.99Price range: £34.99 through £445.99. Price range: £31.49 through £401.39Current price is: £31.49 – £401.39Price range: £31.49 through £401.39.
Select options
This product has multiple variants. The options may be chosen on the product page
Plagron Green Sensation
Original price was: £69.99 – £419.99Price range: £69.99 through £419.99. Price range: £62.99 through £377.99Current price is: £62.99 – £377.99Price range: £62.99 through £377.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Shogun Sumo Boost
Original price was: £14.99 – £419.99Price range: £14.99 through £419.99. Price range: £13.49 through £377.99Current price is: £13.49 – £377.99Price range: £13.49 through £377.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Shogun Sumo Boost Active
Original price was: £14.99 – £419.99Price range: £14.99 through £419.99. Price range: £13.49 through £377.99Current price is: £13.49 – £377.99Price range: £13.49 through £377.99.
Select options
This product has multiple variants. The options may be chosen on the product page
RAW Full Up
Original price was: £21.99 – £407.99Price range: £21.99 through £407.99. Price range: £19.79 through £367.19Current price is: £19.79 – £367.19Price range: £19.79 through £367.19.
Select options
This product has multiple variants. The options may be chosen on the product page
Bio Green X-Blast
Original price was: £69.99 – £399.99Price range: £69.99 through £399.99. Price range: £62.99 through £359.99Current price is: £62.99 – £359.99Price range: £62.99 through £359.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Bio Bizz Bio Heaven
Original price was: £21.99 – £389.99Price range: £21.99 through £389.99. Price range: £19.79 through £350.99Current price is: £19.79 – £350.99Price range: £19.79 through £350.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Athena Blended Grow A & B
Original price was: £89.99 – £384.99Price range: £89.99 through £384.99. Price range: £80.99 through £346.49Current price is: £80.99 – £346.49Price range: £80.99 through £346.49.
Select options
This product has multiple variants. The options may be chosen on the product page
Green Planet Bud Booster
Original price was: £29.99 – £369.99Price range: £29.99 through £369.99. Price range: £26.99 through £332.99Current price is: £26.99 – £332.99Price range: £26.99 through £332.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Canna Boost Accelerator
Original price was: £23.99 – £369.99Price range: £23.99 through £369.99. Price range: £21.59 through £332.99Current price is: £21.59 – £332.99Price range: £21.59 through £332.99.
Select options
This product has multiple variants. The options may be chosen on the product page
Dutchpro Take Root
Original price was: £19.99 – £349.99Price range: £19.99 through £349.99. Price range: £17.99 through £314.99Current price is: £17.99 – £314.99Price range: £17.99 through £314.99.
Select options
This product has multiple variants. The options may be chosen on the product page
GHEDirect LTD, 
