This annual is found by rivers and canals, on damp and waste ground, and on tips in urban areas and ports. Lowland.
B. frondosa was first cultivated in Britain in 1710. It was recorded as a casual in 1918 but not known as a naturalised plant until it was found on a canal towpath near Birmingham in 1952 (Cadbury et al., 1971). Its vector is unknown, but it may be a wool alien. It is now frequently naturalised by canals in the English Midlands.
Native of N. & S. America; widely naturalised in temperate Europe.
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