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.
Plant Magic Pure Clean 250ml
Original price was: £11.99.£10.79Current price is: £10.79.
CX Horticulture Bio Balancer
Original price was: £31.99 – £109.99Price range: £31.99 through £109.99. Price range: £28.79 through £98.99Current price is: £28.79 – £98.99Price range: £28.79 through £98.99.
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This product has multiple variants. The options may be chosen on the product page
Genesis Pro-Tect 1 Gallon
Original price was: £109.99.£99.00Current price is: £99.00.
Genesis Liquid Sand 1 Gallon
Original price was: £59.99.£53.99Current price is: £53.99.
Genesis P/K Plus 1 Gallon
Original price was: £69.99.£62.99Current price is: £62.99.
Hygrozyme Hygroben 4 Litre
Original price was: £149.99.£134.99Current price is: £134.99.
RAW Kelp
Original price was: £18.99 – £239.99Price range: £18.99 through £239.99. Price range: £17.09 through £215.99Current price is: £17.09 – £215.99Price range: £17.09 through £215.99.
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This product has multiple variants. The options may be chosen on the product page
RAW Terpz 8.37oz – 237.5g
Original price was: £14.99.£13.49Current price is: £13.49.
GK-Organics Seaweed Powder
Original price was: £21.99 – £69.99Price range: £21.99 through £69.99. Price range: £19.79 through £62.99Current price is: £19.79 – £62.99Price range: £19.79 through £62.99.
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This product has multiple variants. The options may be chosen on the product page
Essentials Silicon
Original price was: £10.99 – £27.99Price range: £10.99 through £27.99. Price range: £9.89 through £25.19Current price is: £9.89 – £25.19Price range: £9.89 through £25.19.
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This product has multiple variants. The options may be chosen on the product page
VitaLink Chill 250ml
Original price was: £24.99.£22.49Current price is: £22.49.
Evoponic Goliath
Original price was: £21.99 – £219.99Price range: £21.99 through £219.99. Price range: £19.79 through £197.99Current price is: £19.79 – £197.99Price range: £19.79 through £197.99.
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This product has multiple variants. The options may be chosen on the product page
A.R.T.S. Flower Power 1 Litre
Original price was: £94.99.£85.49Current price is: £85.49.
Ecothrive Soil Food
Original price was: £14.99 – £49.99Price range: £14.99 through £49.99. Price range: £13.49 through £44.99Current price is: £13.49 – £44.99Price range: £13.49 through £44.99.
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This product has multiple variants. The options may be chosen on the product page
Aptus Mycor Mix 100g
Original price was: £31.99.£28.79Current price is: £28.79.
Advanced Nutrients Ancient Earth 1 Litre
Original price was: £29.99.£26.99Current price is: £26.99.
VitaLink Heat 250ml
Original price was: £24.99.£22.49Current price is: £22.49.
A.R.T.S Terra Bact 1 Litre
Original price was: £29.99.£26.99Current price is: £26.99.
B’Cuzz Silic Boost 1 Litre
Original price was: £179.99.£161.99Current price is: £161.99.
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.
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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.
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This product has multiple variants. The options may be chosen on the product page
Green Planet PK Spike 1 Litre
Original price was: £29.99.£26.99Current price is: £26.99.
Fish Sh!t 500ml by Fishhead Farms
Original price was: £64.99.£58.49Current price is: £58.49.
Advanced Nutrients Sensi Cal Mag Xtra 1L
Original price was: £24.99.£22.49Current price is: £22.49.
Advanced Nutrients OG Organics Tasty Terpenes 1L
Original price was: £44.99.£40.49Current price is: £40.49.
British Organics Bio Microbes 1 Litre
Original price was: £59.99.£53.99Current price is: £53.99.
British Organic Bio Organic CalMag 1 Litre
Original price was: £29.99.£26.99Current price is: £26.99.
British Organic Bio Sea Silica 1 Litre
Original price was: £47.99.£43.19Current price is: £43.19.
British Organic Bio Organic Boost 1 Litre
Original price was: £71.99.£64.79Current price is: £64.79.
Plagron PK 13-14
Original price was: £11.99 – £49.99Price range: £11.99 through £49.99. Price range: £10.79 through £44.99Current price is: £10.79 – £44.99Price range: £10.79 through £44.99.
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This product has multiple variants. The options may be chosen on the product page
Fruit Machine 1 Litre
Original price was: £59.99.£53.99Current price is: £53.99.
GEN200 Control 1 Litre
Original price was: £149.99.£134.99Current price is: £134.99.
Biobizz Leaf Coat
Original price was: £9.99 – £139.99Price range: £9.99 through £139.99. Price range: £8.99 through £125.99Current price is: £8.99 – £125.99Price range: £8.99 through £125.99.
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This product has multiple variants. The options may be chosen on the product page
Ecothrive Trace
Original price was: £8.99 – £74.99Price range: £8.99 through £74.99. Price range: £8.09 through £67.49Current price is: £8.09 – £67.49Price range: £8.09 through £67.49.
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This product has multiple variants. The options may be chosen on the product page
Terra Aquatica Seaweed 1L
Original price was: £24.99.£22.49Current price is: £22.49.
GHEDirect LTD, 
