An annual of waste and ruderal habitats, arising principally from bird-seed and culinary sources, and usually occurring as a casual. Lowland.
L. sativum has been grown in gardens since at least 995 (Harvey, 1981) and was known from the wild by about 1860. It is the original `cress` of `mustard-and-cress`, but is now very largely replaced in salads by Brassica napus. There is no indication of a change in frequency in recent years.
Probably native of Egypt and S.W. Asia; as a naturalised or more frequently casual plant it is widespread in Europe and elsewhere.
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