Went to Zell for the IronMan 70.3 World Championships presentation and took my running gear with me. It was raining (what’s new) and it stroke me how many nettles were there around the lake.
Leaves and steams of the nettle or Große Brennnessel (Urtica dioica) have small fragile hair which actually are tiny capsules full of various liquid chemicals such as formic acid. While touching the leaf, a hair, sharp like a needle, gets into your skin, then breaks down, and liquid gets injected into your skin. Nettle stems contain a fiber which may be (and was!) used for making ropes, sails and fine linen cloth, suitable even for shirts and beddings.