The Brennnessel (alternative spelling: Brenn-Nessel) is abundant in Germany. If you or your children brush up to it with your legs, you will feel a burning sensation, hence the name stinging nettle. This burning is caused by a liquid the plant releases onto your skin.
Tip: Always carry a bottle of tap water with you. A quick rinse over the burning skin will give an immediate relief.
Vorsicht! Brennnesseln!