Two of the lime trees are dripping with blossoms and wafting their heavenly fragrance for all to enjoy. These are Mexican limes--the same as Key Limes. What many people don't realize, is that they are juiciest and sweetest (and make the best margaritas and Key Lime Pie) when the skins are yellow--not green. When fully mature, they drop and you can harvest from the ground. Prune the lower branches to avoid serious thorns.