Key lime trees will grow true from seed. Not all citrus is this way. More than one tree might grow from one seed so cut away any extra trees that sprout when small. Don't pull it out, that will disturb the roots of the one you want to grow.
Key lime is frost sensitive but by growing it in a pot I can bring it indoors when a frost is predicted. I personally use a 5-gallon paint bucket with a handle and drill holes about one inch from the bottom of the pot to allow some, but not all of the water to drain. I then hide the ugly bucket by placing it in a larger, more "beautiful" pot. Key lime trees can reach 6-8 feet high and wide, but I keep mine pruned to about 4 foot to keep it manageable to move indoors.
As with all citrus, the blooms are very fragrant. The key lime fruit are juicy but seedy. Juice can be used in beverages, pies, and cooking. The peels can be used to zest or candied.
Key lime trees require high temperatures and lots of sun. Humidity does not bother them. I use a homemade soil recipe of compost, peat moss, perlite, and worm poop. I use the worm tea as both a root and leaf fertilizer and supplement it with worm poop.
