This Citrus is also due to Howard Frost, but nurseries have long dropped his name from the title:
I believe they are coming under the fence from next door. I put down Sluggo regularly but sometimes they beat me to the punch. The Lemon and Lime trees adjacent to it are snail free!
Spring through Fall I try to maintain about 70 gallons per week. I fertilize all my fruit trees with Grow More 16-8-24 but also supplement the Citrus with 21-7-7.