Flower about 1cm across
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Well that's a new one to my garden - The hooked seeds must have come in via a cat's fur or on my clothes!
quite invasive if you let it - like Herb Robert, which I ignored as a pleasantly tolerable weed, until I had to spend a couple of hours tacking what was becoming a monoculture. It is attractive, though.
Lat/Lng: 51.9, 1.3
OS grid ref: TM3034