On 14 Aug, 16:16, kay wrote:
Yes, self-heal. Pretty thing, isn't it?

I like it a lot. I've got several patches of it, and would not dream
of trying to remove it. The flowers are popular with bees and
butterflies, and remember being told at school that it was an
indicator of roman settlement, as legions used to carry it and plant
it for medicinal reasons. I doubt that any such link, if it was ever
true, can be made now because it is so widespread.