When growing autos in soil like Fox Farms Ocean Forest, what amount of Cal Mag do you use? I feel as though my last grow, giving Cal Mag at every feeding was too much. This grow, I plan to see if once a week is enough.
one mil per two ltr of water. i use coco but when they need it they need it need it, you don't consistntly need to use it like coco growers need to. hope this helps
When growing in decent soil with good pH and using proper cannabis nutrients, I only ever give two or three doses of cal/mag during early flowering as a "preventative" and never seem to suffer any deficiencies of cal/mag.
I do however add blood and bone meal to my soil mix, which is a good source of calcium and also add volcanic rock dust, which is loaded with trace elements and also has good amounts of magnesium and silica.
Cal/mag supplemental feeding is far more essential when growing in coco coir, it seems to bind them up and make it difficult for the plant to access them.
I would suggest that giving extra cal/mag every 2-3 weeks would be more than enough in decent soil.
Hope this helps, Organoman.
