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The Lime Sapling is a sapling added by Pam's HarvestCraft, which grows into a Lime Tree, a Jungle Tree with Limes under the shade of the tree. When a Lime is ripe, it can picked by breaking the Lime block.
Lime Trees will spawn in "wet" or "hot" biomes, but not "plains" or "dry" biomes. The Lime Tree will not drop any Lime Saplings; the only way to obtain saplings is through crafting.