How big is your tree? I like the EB Stone organics when they're small, but it becomes cost prohibitive if the tree is mature. For my mature, in ground trees, I use the Bandini citrus fertilizer and the fruit is excellent.

My citrus trees are about 2 to 3 feet tall and some smaller ones that I grow in pots because I live up north.
Wish I could grow them outside all year long.:-(

Hi, Sissy - I have more than 200 trees and woody plants in containers and I haven't yet found a plant that doesn't respond exceedingly well to MG 12-4-8 liquid, or MG 24-8-16 granular soluble fertilizers. I use it (the 12-4-8 liquid) exclusively on trees. Both fertilizers also contain Fe, Zn, and Mn in an appropriate ratio to N. This leaves it to you to be sure the trees are getting the Ca and Mg they need (which is true of most soluble/liquid fertilizers).

Al

Best fertilizer for Citrus is an acid fertilizer.
the more you give them the more they bloom!

They love to be planted in peat moss, mixed with Sand.
and lots of mulch. Also, once a year use garden sulfer.