Avocado tree may be planted during any time in the year except very hot weather in summer. However, an avo plant will adapt best to the new site when planted in early fall, recommends the Better Homes & Garden's "Vegetable, Fruit & Herb Gardening." This is just when the weather is getting a little cool with the soil still on the warm side.
The growing culture is just as important as the right transplanting time for ensuring healthy tree growth. The avo plant adapts to a range of well-drained soil with poor tolerance for flooded or poorly drained ground. Avoid planting in continually wet soil as this will affect growth and fruit yield. Under severe conditions, the tree is likely to suffer dieback, root rot diseases or total death. Sandy and limestone soil produce optimal growth.
Like soil conditions, though the avo will tolerate partial sun and shaded site, it will grow optimally and produce high yield only when provided full sun exposure. This is especially important in cooler, northern regions. Allow ample room of at least 20 feet around the tree for easy growth. Established trees are maintenance free and fairly hardy. Whitewash the trunk or branches in order to prevent sunburn.
Water the newly planted avo plants well immediately after planting. Water every other day during the first couple of weeks. Water at least twice a week for the next few months. Take care of regular watering especially during dry and hot weather or periods with little or no rainfall. Reduce watering rate during rains. As trees mature, the demand for water also generally decreases. However, irrigation between blooming and fruit growth time leads to good yields and reduced stress on tree.