Stace describes this introduced plant as a pernicious weed of garden paths and he's not wrong. This plant arrived about 10 years ago on our path and the best weed killer won't get rid of it probably because it produces abundant seed. In hot weather, touching a ripe pods results in an explosive distribution of seeds.
Garden Path, Cheshire 8th May 2005
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Added on 27th May 2005, corrected 15th Feb 06