Should potted Mums be covered?

They are frost hardy & do better in the garden,not pots.

It actually depends largely on the type of mums you have, the size of the container, your zone etc. Any plant in a container is more susceptible to freezing because the container will get much colder with the air circulating around it. A container doesn't hold heat like the ground does. I would definitely cover them and possibly move the containers in if you are going to have a hard freeze or freezing winds. Even having them in the garage will help. You can mulch the soil in the pots to help with insulation as well. Since I don't know exactly where you live or what type of mums you have, this article may help to answer some of your questions. If it doesn't, click on the link to the right "Ask a Gardener" and give more information. :) Good luck!

It wouldn't hurt. While they are pretty frost tolerant, they will look better if the frost can't settle on them so a non plastic covering or plastic held above the foliage will be fine. Freeze.......well that's another story. Roots are not freeze loving so the pots themselves would need protection. Frost doesn't affect the pots like a deep freeze would.

Actually, they should be planted in the ground before frost is a factor. They will probably die off in the pot, covered or not.