Stinging Nettle is a wild growing weed. It's best to harvest first thing in the spring, however larger leaves in summer can still be used for tea making.
Stinging nettle contains fiber, and protein, and is a packed with Vitamin C. It also provides Vitamin A and other healthy nutrients. It helps with seasonal allergies, helps removed retained water, reduces joint pain (arthritis), swelling, helps hair growth, may help with urinary issues, and more. To obtain more information on edible and medicinal weeds, check your local library for resources. Here is one useful book: