I haven't fed them anything.. I bought a bag of mixed dirt from home depot, mixed in some perlite and moss.. Watered it down, let it sit in the hot sun for a week, then re wetted the soil and then put my seeds in the soil.. I find that the fertelizers in the soil will cause the leaves to start getting brown spots and wilting, so I water the soil and let the sun hit it for a week, then do the planting in the pot.. Other than that.. If I saw any signs of browning on leaves, I did the coffee mixed with water/really diluted and fed them that.. Other than that, all these plants have seen is water right out of the tap. Nothing special.