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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.
Do not grow seedlings from supermarket avocados, for sev-eral reasons: Avocados do not come true from seed; ungrafted seedlings may take up to 10 to 15 years to bear fruit; and salty irrigation water can cause moderate to severe leaf tip burn on these plants. In Texas, the most common propagation method is cleft (tip) grafting. Other grafting methods also work. Some Mexican avocado varieties can be rooted or air-layered, but their lack of salinity tolerance will remain a problem. Plant the trees no closer than 10 to 15 feet from the house. Space avocado trees 20 to 30 feet from each other and from other large trees (Fig. 4). Avocado trees are produced in containers of soilless media.