It should be hardy where you are w/o protection. Put it on the north side of the house up against the foundation & mulch a little. Make sure you toss some snow on the container from time to time to keep roots from drying completely if Mother Nature seems attentively lax in that regard. Al

Creeping phlox, Phlox subulata, is extremely cold hardy, down to zone 2. I doubt you have much to worry about regarding its ability to overwinter in your container. I'd be more concerned about the ability of the container itself to withstand any freezing winter temperatures. If this is an issue, moving the pot into an unheated garage or similar facility that would avoid the moisture and temperature extremes that could cause the container to freeze and crack would be in order. Light is not an issue over winter as the plant is dormant but you would want to check that the soil does not dry out excessively. Keep it just barely moist.

I went through this same mix-up last winter. By doing lots of research, I realized that Dimorphotheca seems to have flowers in the yellow range only, is annual, and has flat,papery, pale seeds. It seems that Osteospermum has shades in white/blue/purple shades, is perennial, has little brown triangular ridged seeds, and the seeds are quite expensive when compared to Dimorphotheca. For this reason, I am trying my best to stick to the Latin names if I have them, as my friend who owns a seed company has been trying to impress upon me for years! The Dimorphotheca seeds I got in a trade this year have germinated and are doing well. A gardening neighbour had promised to split some of her Osteospermums this spring and share them with me but unfortunately, she passed away suddenly of a stroke on Dec. 26. I will miss her so much this year. Her house has been sold and I hope the new owners don't destroy her garden. She was 3 years into a 5 year project to create a meadow garden and it was coming along so nicely. I'll buy seeds and plant them in her memory. Northerner.

* Silver Princes Shasta Daisy (I grew these plants from seed three years ago) * Crazy Daisy Shasta Daisy (NEW! Growing from seed this year. The flowers look like Marguerites! Very frilly.) * Gloriosa Daisy (growing them from seed) - Love these big Sunset yellow and orange flowers. Reminds of a desert sunset on the mesa. I have some Clara Curtis seeds I got in a trade. Never have tried to grow them yet. Guess I'll give them a try. Thanks for reminding me, Glenda! They sure are pretty. I have English Daisy seeds to sow in April. I direct seed them into the garden every year. So pretty. Not sure that you would call these daisies, but I bought a one little pot of Coreopsis verticillata 'Moonbeam' & one of Coreopsis hybrida 'Sweet Dreams' Coreopsis last year. I planted the Moonbeam in the potager. There a dozens of tiny seedlings coming up around where the mother plant was. They are growing to the front of a bed of Double Pink Knock Out Rose and Double Yellow Knock Out Roses. Moonbeam's soft, buttery yellow color will look pretty in with those roses. Self-seeded Chamomile is coming up and California poppies that I planted on the 15th are up. Tall Mauve Bread seed are everywhere in that area of the garden. I never know where they will move to each year. Pink & white Tasha Tudor HH's transplanted behind against the fence and Black and Blue Salvias I moved back there last fall. I transplanted a Don Juan (cl) rose back there to grow on the fence. Larkspurs and Heleniums are coming up on the other end and white Baby's Breath. Bright Periwinkles and white and purple Sweet Allysum will probably coming back from seeds, and who knows what else. I love bold splashes of color throughout my garden. I don't know if the Sweet Dreams reseeds or not since it is a hybrid, but the plant kicked it - darn it. Sweet Dreams Coreopsis is pink with purple to red centers. Very unusual colors for a Coreopsis. ~Annie