I admit I have not been growing mine a long time, but I started mine in loamy sand soil mixed with well-rotted compost with manure, in 3-gallon containers. When they were growing well, and large, I provide a teaspoon of 13-13-13 fertilizer top dressed onto the soil in the pot, roughly every month.
I water daily, about a quart per container. THey never fully dry out. At this point, in the heat, I think water is more important than the fertilizer. Mine have survived 102 F (39 C) heat, still growing strong.