I ordered some online since locally, I couldn't find healthy specimens in the color I wanted. They are small. The containers they came in were 6" (max size) pots which I planted a week ago (here, they say it's better to plant them in the fall than the spring). How do I tell if they're ready for the winter? We've had some dips to freezing weather. I've been covering them but I'm not sure if I should. I want them go to dormant but I don't want them to die either. Any advice is appreciated!