Canna - Mono Magnesium Do what the label says

Do what the label says (and what commercial growers do) and use Tanlin as a preventative

and rockwool substrates

HESI Fertiliser for COCO - HESI COCO

Fully available trace elements

Canna - Mono Magnesium Do what the label saysThere are lots of high quality, ready made base nutrient formulations out there which have been optimised for certain substrates and different stages of the plants' life. Despite this, deficiencies can, and often do, still occur. Canna Mononutrients only contain one nutrient element in each bottle (except for the Trace Mix). This allows the grower to identify and treat a deficiency in one particular nutrient without having to feed more of everything