SaplingGrowTreeEvent is fired when a spling grows into a tree.
This event is fired during sapling growth in
BlockSapling#func_149878_d(World, int, int, int, Random).
x contains the x-coordinate of the growing sapling.
y contains the y-coordinate of the growing sapling.
z contains the z-coordinate of the growing sapling.
rand contains an instance of Random for use.
This event is not
Cancelable.
This event has a result.
Event.HasResult
This result determines if the sapling is allowed to grow.
This event is fired on the
MinecraftForge#TERRAIN_GEN_BUS.