This European introduction can be a "wall weed" growing out of every stony nook and cranny where the seeds fall. It is actually quite an attractive plant so is grown in gardens until the owners get to know how rampant it can be.

It is ubiquitous in Southern England but thins out as you go towards Scotland with very little north of Inverness. There is a little in Ireland but only dotted about.

Wall in Cressbrook, Derbyshire, 10th May 2006

Added on 16th May 2006, updated 28th July 2011