Just touching your base to let you know I've track tested a couple items in the list. I have always liked using ashes from a hardwood fire for nute especially when it starts flowering. This is one of nature's greatest source of soluble potash (potassium). This week I used ashes from the Barbecue grill and sprinkled liberally around the bottom of the plant. The other item I have always wondered about was using vinegar as acid for Ph down. Used a Tbs/gal as directed and it really greens them up. It worked really nice on my Tomato plant as well.