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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.
Special Considerations. Avocado trees require horizontal spacing of 20 feet to accommodate their mature spread, and 30 to 60 feet of vertical space for height. Avocados grow best when humidity levels are high. Locate the tree in an area sheltered from high winds but open to slight breezes.epending upon the variety, avocados grow in U.S. Department of Agriculture plant hardiness zones 8 through 11. The most cold hardy of the three types is the Mexican avocado, which will grow in temperatures as low as 19 to 20 degrees Fahrenheit.