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The Avocado Sapling is a sapling added by Pam's HarvestCraft, which grows into an Avocado Tree, an Oak Tree with Avocados under the shade of the tree. When an Avocado is ripe, it can picked by breaking the Avocado block.
Avocado Trees will spawn in "forest" biomes, but not "cold" or "spooky" or "mountain" biomes. The Avocado Tree will not drop any Avocado Saplings; the only way to obtain saplings is through crafting.