Nutrients and pH

Learn what calcium does for cannabis plants, where to get it from amendments, supplements and nutrient solutions, and how pH affects calcium uptake.

Dark leaves or slow growth? Learn how to tell a low phosphorus feed from an uptake problem in cannabis, check pH and roots first, and correct it the right way.

Interveinal yellowing on older leaves? Check pH and roots first, then learn how to confirm magnesium deficiency in cannabis and correct it without overdoing it.

Spot calcium deficiency in cannabis, check pH and roots first, and correct a real shortage with the right calcium source without overfeeding.

Learn the pH range for soil, coco and hydro cannabis, how to test feed, runoff and soil, and how to correct pH before it causes nutrient lockout.

Spot nitrogen, phosphorus, potassium, calcium, magnesium, iron, manganese, and zinc deficiencies by leaf symptoms.

A DIY marijuana nutrient solution usually starts with finished compost or simple organic inputs you control at home — not

A cannabis zinc deficiency shows up on the youngest growth first. Iowa State Extension lists the classic signs on young

Sulphur, spelled sulfur in the US, gets less attention than nitrogen, phosphorus and potassium, but plants need it to make