I have this misterious plant in my perennial garden. First year, after we moved here from Midwest, I took all the seed packages I had and spread the seeds around. I think everyone has such packages received from relatives, friends, from catalogues, garden shows, etc. I had a bunch of them, some were already expired. I said my usual: If you want to live, you'll survive! Sure enough, next spring I got several survivors. This one, on the picture, looks like an annual, selfseeds, and goes strong already for 5 years without my help.
There are thousands of them and they create beautiful bright pink wave in the corner of the garden.
I am sure it is some ordinary plant and you can help me to get its name. I took it once to a nursery, but a person whom I asked couldn't help me.
Thanks for your time!