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Side by side
What tells them apart
Dead-nettle looks the same from a distance and does not sting: it has large tubular flowers, purple or white, which true nettle never has.
Harmless confusion
How to tell it
Opposite heart-shaped leaves with a sharply toothed margin, covered in hairs visible against the light. Square stem. Grows in dense patches, almost always near livestock, ruins or old refuse.
How to tell it
Opposite heart-shaped leaves with a toothed margin and often a pale stripe along the midrib. A four-angled stem. Purplish pink hooded flowers in groups at the leaf axils. No stinging hairs.