Quests of Doom 4: The Desperation of Ivy - Swords & Wizardry

(for 4 to 6 characters from 4th and 7th level)  

A once-imposing residence called Coltherstone Hold was abandoned years ago, and in the decades since, a fantastic amount of vegetation has grown up the walls and rooftops, covering the structure. Many of the plants are dangerous — deadly, even — and reclaiming the hold will require more than just a few machetes to chop down some weeds. Much worse, a few of the plant specimens possess intelligence as well as an undo degree of malevolence. They’ve infested a nearby village — all but burying it in overgrowth — and have absorbed a few villagers along the way. 

For Swords & Wizardry.