Take look at the content label on any bottle of fertilizer. Notice the items listed in the highest percentage. Especially the N-P-K. Go to anywhere, search for the individual components. For instance, a 5lb bag of FeSO4 costs about $25. Lasts forever and is a good for foliar applications. Depending on your type of culture and water you may or may not need to consider micronutrients. But that stuff at cvs.
I have a ton of leftover G&H Soil B. I like it but honestly I’m only using it because it’s here and already paid for. Does anyone have a good (and inexpensive) suggestion for what I can use in place of the Soil A formula?
I just figured if I have to purchase part A or an equivalent, then maybe there’s something out there that might be more cost effective.