Cold Hardy Avocado Trees are the Perfect Patio Plant, growing indoors or out. They reportedly withstand temperatures down to 18F. In colder states, you can bring them in for the winter where they will continue to grow and produce fruit. Just place them near a sunny window and they'll become your favorite houseplant. You get a lot of Avocados to eat and share. Even compact patio trees can produce a hefty harvest. I'm OBSESSED with avocados.