Sanguisorba officinalis
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The extensive root system of Burnet has been used to control soil erosion and reclaim derelict sites like landfills. It is a tough plant native to grasslands and at home in lawns, grassy banks, and the like. Leaves have a mild cucumber like flavour and are used in salads. Will grow from seed sown direct in most sites. Flowerheads can be removed to encourage more leaf production.