Commercial avocado trees are propagated by grafting of budding scions of desirable cultivars onto seedling or grafted rootstocks. Avocados can be grown from seeds, but fruit quality and yield potential will be quite variable. Grafted or budded avocado trees usually produce fruits when three to five years old, while seedlings often require five to seven years.To avoid contamination from Phytophthora root rot in the nursery when growing seedling rootstocks for grafting, (1) do not use seed from windfall fruits picked up from the ground, (2) propagate seedling rootstocks in sterilized, disease-free media, and (3) do not allow containers to contact soil.
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