Found in, around and under all hedgerows. September is the last month to harvest the leaves, as after this they wither.
Contain: Formic acid, an antibacterial, which is one of the key ingredients responsible for the stinging feeling on contact. Also contain the neurotransmitter serotonin, and histamine, which is involved in the immune system response.
What's new: A study at Exeter and Plymouth universities shows that nettles may ease the pain of osteoarthritis of the knee. Serotonin and histamine in the nettles might block the pain signals.
At home: Make nettle tea for joint problems. Pour boiling water over a handful of fresh leaves in a warm tea pot. Leave for five minutes before straining and drinking.
Tip: A sprig of nettles in the kitchen is a traditional way to keep flies away.
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