Hazard to (Plant) Life

Glancing away from him and pretending to study to plant in front of me as it continued to show off its aggression, I admitted, "I've got a black thumb." "A black thumb?" he repeated dubiously. "I do!" The force of my insistence had Longbottom stifling a smile, not that it worked too well. "I don't know how I do it, but I always end up killing every plant I touch."