The stinging nettle is a regular “Jack-of-all-trades.” It can do very, very much. It, too, carries within it the element which incorporates the Spiritual and assimilates it everywhere, namely, sulphur, the significance of which I have explained already. Moreover, the stinging nettle carries potassium and calcium in its currents and radiations, and in addition it has a kind of iron radiation. These iron radiations of the nettle are almost as beneficial to the whole course of Nature as our own iron radiations in our blood. Truly, the stinging nettle is such a good fellow and does not deserve the contempt with which we often Look down on it where it grows wild in Nature. It should really grow around man’s heart, for in the world outside — in its marvelous inner working and inner organisation — it is wonderfully similar to what the heart is in the human organism. The stinging nettle is the greatest boon. (Steiner 2007:46)
STEINER, Rudolf. 2007. The Agriculture Course. (Trans.: George Adams) Shrewsbury: Wilding & Son Ltd.