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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.
The avocado tree is a native understory tree to the humid and semihumid tropics. It seems to do best at moderately warm temperatures (60 - 85F) and moderate humidity. It can tolerate temperatures, once established, to around 32 - 28F with minimal damage.