My calendulas in Utah have survived the winter, even with LOTS of snow! I'm positive that they weren't seedlings, since I had tied a string around one just to see if they were actually surviving. Mine have also done really well with high heat. At 110, they looked as good as ever. Maybe it's because it's so dry there? I wasn't crazy about them at first because they reseed bad, but I had a new appreciation for them once I saw them survive winter, and summer!
