Ok. The nutrient requirements for fruit trees and cannabis do not match because a fruit tree does not need to peak any nutrients like cannabis. The nutrition needs of cannabis change but fruit trees need the same stuff all the time.
Coffee has a much lower potassium needs than cannabis and the plant would struggle with this.
But here is the thing the soil might be ok as a start to living soil for cannabis. If you could get some more peat moss to dilute the mix and possible get the ingredients for potassium ( kelp meal ) You may be able to make a soil.
This would be a huge undertaking.
Is it possible for you to get chemical plant food?
Could you get some 5 gallon buckets and some air pumps and do a hydro setup?
Not having access to stuff sucks. Youāve got your
LED lighting built for Texas heat, but can you even get packages from out of the country like organic nutrients, or is that too much to ask?