I do a lot of growing in LARGE plastic containers (20-30 gallon). however, I am running our of soil to put in the containers. I have a source of coffee grounds, and thought I would use coffee grounds, filling up the containers only half way, then using my own mix of garden soil, perlite, vermiculite, peat moss, and sand which has proven satisfactory as a growing medium for me.
Should I add the folowing to the coffee grounds:
incorporate some perlite, and in what proportion?
incorporate some Vermiculite, and in what proportion?
Incorporate some soil, and in what proportion?
Incorporate some peat moss, and in what proportion?
Incorporate some other item, or items, and in what proportion?
Incorporate any mix of the above, and in what proportions?
Add in some item(s) other than above?
I would appreciate your suggestions. THANK YOU!