I first made a tiny lemon tree a couple years ago, and I've been meaning to write a tutorial about it ever since.
Recently I completed a tutorial that goes into detail about how you can make your own tiny citrus tree (mainly just lemon, lime, or orange) and I'm pretty chuffed about it!
Anyway, this is all for 1:12 scale builds (although I'm sure you can stretch the technique for anything between 1:16 - 1:10) and I'd love to see your own tiny fruit tree if you follow this tutorial :)