Just read the directions on the bat guano. Sunleaves Mexican Bat Guano. Older or larger plants, mix up to 3 tablespoons per gallon of water and apply during the vegetative cycle of growth. Repeart every 4 weeks. Every 4 weeks? I will be flowering in about 6. Does that mean I'm only going to be able to feed them the guano once before I flower? I thought the guano was something you added to every feeding? Also, I'm using FFoF. I was told by somebody else that I didn't need guano because the FFoF already contained it. Can anybody confirm this? Thanks for the responses.