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If you plant a seed, and are skilled enough to graft the seedling when it is approximately one year old, you could, with good care, have a tree producing avocados in 4 to 5 years after planting the seed.
Avocado trees (Persea americana) can bear fruit if planted in U.S. Department of Agriculture plant hardiness zones 9 through 11. The trees do not start fruiting until at least five years after planting. Avocado flowers are open two days. The first day they are female, the second day they are male.