Sarsparilla Barn, the attached Bunkhouse, the ruins of the former ranch house, and immediately surrounding environs.
The spot near the northeastern barn door where the physical form of the Cloven Prince melted, that is a spot where nothing will ever grow -- not even worms, not even flies. The dirt from that spot will never be good for any life, neither!
Some other areas continue to show signs of fast plant decay. It will take many years for the residue of a druidic plant growth region followed by an infernal Greater Curse will work out of the soil. It will take almost as long for that persistent slime on the northwest face of the Bunkhouse roof to completely dry up and vanish, too!