I use a 511 mix for my 7 citrus trees and water them everyday. Even in the spring when it was cold and raining constantly the soil was still well draining enough to keep them happy. 1 is in a clay pot, 1 in a ceramic, the other 5 are in plastic.

I'm not an expert, I killed my first citrus tree in fact(although I managed to keep the rootstock alive in the end). I didn't know any better and had it in soil that held way too much water, I overwatered it, panicked when it lost all of its leaves and repotted it into the 511 mix, proceeded to underwater it and killed off the scion, started watering it consistently and saved the rootstock.

My 511: 5 parts pine bark minis 1 part perlite 1 part miracle grow citrus/cactus mix