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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.
Roots are coarse and greedy and will raise pavement with age. Grafted plants normally produce fruit within one to two years compared to 8 - 20 years for seedlings. Foliage: Avocado leaves are alternate, glossy, elliptic and dark green with paler veins. They normally remain on the tree for 2 to 3 years.