Looks like a Geranium.

Bigroot geranium.

Can you tell me more?

Funny you should tell me it's a geranium! That's what I've always called it..."wild geranium". Since all I know of geranium is what I buy each spring and the bud worms kill each summer. Then I buy it again the next spring! Duh!

It's a hardy or true geranium, Geranium macrorrhizum (macrorrhizum = 'bigroot'). I'm not sure I'd call it a wild geranium as most forms of hardy geranium are pretty heavily cultivated, as this one is. What are typically sold as annual (zonal, windowbox) geraniums each spring are really Pelargoniums, related but not the same plant.

Bigroot geranium makes a great groundcover, especially for dry shade, but it is also tolerant of a lot of growing conditions, including regular garden soil in full sun. A local semi-park commercial area close to me has used it widely in this type of situation and it looks pretty spectacular right now in full bloom. btw, this is an area that gets NO supplemental irrigation and a lot of foot traffic, so a very durable plant and a tough garden workhorse. There are a number of named forms with a range of colors from pure white through all shades of pink to the deep magenta pink of the species. And one with a variegated leaf as well. In zone 8 it should be pretty much evergreen with a distinctive fragrance to the foliage.

Oh wow, I'm glad I stumbled across this post! My great aunt brought me some of this about 4 years ago and said, "this is something-wort, it spreads" while waving her arms about and then walked off. That's generally the description I get when she brings me a plant. I generally hold my breath, plant it, and wait for disaster as her gifts take over my garden. This one got planted in what is basically gravel over clay next to my camper and has been beautiful since then... even in rather horrific conditions. By the way, my flowers are white.

Now I know what to tell people when they ask what mine is!

Wonderful! Your the best! Now I know, I've enjoyed my Bigroot Geranium for years but didn't know what it was called. Thanks!