Coreopsis are sort of hit and miss for me. The pink ones froze out, or like you said, reseeded a bit for me. I had a variegated one, and it died. I now have a yellow one (don't remember the name), but part of the plant dies off on one side, but part of it survives. I'm wondering if it might just be a 'short lived' perennial in the colder climates.

Sue

I have luck with some - Creme Brulee, Golden Gain, Sweet Dreams. They have come back for several years. Have had bad luck with Moonbeam, all the Limerocks, Autumn Blush, the plain pinks and the plain whites.

Lowes sold the Limerock as a perennial. I don't know of anyone around here that made it through the winter with it.

Coreopsis can be a finicky plant. Good drainage will always help for better success. Also, a lot of the heavy blooming perennials, according to Tracy DiSabato Aust, benefit by being allowed to rest closer to fall and winter. She recommends halting heavy deadheading procedures of long blooming perennials such as Gaillardia, Salvia, Gaura, etc as of late summer/fall (August/September) so as to give them better chances to save energy for the following season. Perhaps try that with the Coreopsis to improve situations.

My Early Sunrise is a champ in the full sun, sharp drainage garden, but I've never had any luck with the limerock either. I do scalp the plants pretty severely in late August, so that may help.

That said, I did have one plant that simply died overnight last week. One plant went completely brown and dry, right in the middle of all the other thriving plants. Weird.

I'm assuming you are talking about thread leaf coreopsis. Other than moonbeam they have all croaked for me. Now the nice lanceleafed and others like plains coreopsis are a joy to grow and do well here in Columbus.

I have three different kinds in my beds, all doing well: threadleaf Zagreb (a CHAMP!), Sunshine Superman and Lanceleaf. The Lanceleaf is a wintersown plant and it's grown beautifully but still hasn't bloomed this year; I'm thinking it might next year. I don't deadhead my coreopsis at all.