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The Amaranth is a tree added by Natura. It spawns occasionally in the Overworld inside jungle biomes and saplings will not grow below y:65.
Amaranth trees are very similar to vanilla Oaks, but are much taller and have different wood and leaves.
Amaranth Wood can be made into Amaranth Planks, which can then be made into slabs, stairs, doors, trapdoors, fences, fence gates, bookshelves, sticks, buttons, pressure plates and a workbench. The latters behave exactly to how wooden buttons, pressure plates and Crafting Tables do.