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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.
Overview. Avocado trees benefit from pruning during the first two years to encourage branching. When the tree has produced several crops of fruit, it is desirable to remove the entire top of the tree, then prune yearly to maintain the tree at a workable height.Without this pruning and topping, avocado trees grow to be 40 to 80 feet in height and harvesting the fruit becomes difficult.hen the tree has produced several crops of fruit, it is desirable to remove the entire top of the tree, then prune yearly to maintain the tree at a workable height. Without this pruning and topping, avocado trees grow to be 40 to 80 feet in height and harvesting the fruit becomes difficult.