"Impatiens" called "touch-me-nots" or "jewel weeds" is a large genus of flowering plants. When the seeds are ripe and ready, the dried fruit becomes a trigger. When an animal or human touches the plant, it bursts open and sprays the seeds everywhere. If the ground is wet, the seeds can germinate right where they land; they can also stick to the creature that made the capsule burst open. This can help them be carried off to a new place.