All of the local, private gardens in the area have turned up dead and rotten. The plants died overnight, but anyone with a decent herbalism (or related) skill can tell that the plants have been dead for at least a week. After a second night passes, the plants rot into nothing more than black stubs. On the third night, the trees in the area begin to wilt. This is when the players are called in out of fear of a horrible necromantic attack on the area’s plantlife. If the PCs are in an area where nature is revered, they may even be called in after the first night of strangeness.