The Planter Mob

Undead die in the sun right? Well, every day a zombie like mob known as the "Planter" (feel free to come up with your own name Mojang) will spawn around 50 blocks away from you. It looks like a zombie with vines and growth all over it. It is immune to the sun and once every min will plant and fertilize an oak tree. By the end of the day a special forest will have grown, The Forest of the Undead. Undead mobs spawn twice as much in here and another Planter spawns every day. If you want to stop the Undead Forest's growth just use fire. The forest is very dense so it would be very easy to burn it down and let the sun kill all the undead under it. This is meant to be one of the mob's attacks that can be repelled easily.