Nettle root (Urtica dioica) is also used for joint ailments, as a diuretic, and as an astringent. Stinging nettle above ground parts are used along with large amounts of fluids in so-called “irrigation therapy” for urinary tract infections (UTI), urinary tract inflammation, and kidney stones (nephrolithiasis).
For Tea: Simply add water to your collected nettle leaves and heat to a near boil. Use about two cups of water for a cup of leaves; there's no need to measure. You can make the tea stronger by steeping longer, or weaker by adding more water. Once the water is near boiling, reduce heat and simmer for a couple minutes.