Not just that. Poison trees.
Stinging trees are covered with tiny silicon barbs filled with Neurotoxin. The barbs cover the tree everywhere: bark, leaves, fruit, and are small enough to slip through the holes of your cloths. They are, in fact, to small to see. They essentially act as jellyfish barbs.
If you go to sleep under this tree, you'll die. If you go to sleep on a windy day near this tree, you'll die. If yo seek shelter under this tree during a rainstorm, the rain that makes it through is covered in poison and will chemically burn your skin. When you try top chop it down, barbs, still toxic, go flying everywhere. Burn it, and the hot air will blow off the barbs and they'll rain down on you.
Hey son, wanna' learn how ta' make witch balls?