I am a plant with a unique defense mechanism and have cultural significance. What am I?

1. My leaves are covered in stinging hairs that cause intense pain and irritation.
2. I have been used traditionally for medicinal purposes, including treating arthritis and allergies.
3. I thrive in nitrogen-rich soils and are often found in disturbed areas.
4. Some cultures use me in cooking, but only after careful preparation to neutralize the stinging compounds.