If you live in the low desert (USDA cold-hardiness zones 7-10 and below 5,000 feet) then now’s about the right time to plant citrus trees.
When buying citrus trees, the temptation is always to get the biggest and oldest tree. It just stands to reason that the larger and older the tree is, the sooner it will bear fruit, right?
Actually, when it comes to fruit trees in general and citrus in particular, smaller may be better. It really doesn’t matter how big (or mature) a citrus seems, it will not produce fruit for about three years after transplanting (yes, even if it has fruit on it when you buy it).
So save yourself a lot of work, possible damage to the tree, and possibly some nasty cuts and scratches, and get yourself a smaller, younger tree. Not only will it be easier to transplant, it will also withstand transplant shock better.
Resist the urge to prune established citrus plants. If there is a branch that cuts across a path, or obstructs a view you particularly like, then by all means prune that branch. But be very selective and careful.