Acorn

An Acorn is a kind of Seed used to plant a Tree. Acorns can only be planted on regular green grass, hallow grass or snow, at which point it will create a Sapling.

Acorns are purchased from the Dryad or randomly obtained by cutting down Trees. Corrupt, Jungle and Snowy Trees, however, do not drop Acorns.

History
you wont be able to grow it in water