| Carol Stocker - I am guessing you mean perennials growing in outdoor pots as container plants. The thing that would kill them is winter wind hitting the sides of the pots and freezing the roots, which are more exposed than perennial roots in the ground. I am assuming these are winter hardy plants, which is the definition of perennaials, and not tropical plants. If the plants are winter hardy, what you need to do is get them out of the wind. You could do this by putting them in a sheltered spot near the house or garage or in the garage, clustered together to protect each other. Cut off the top growth first, however, since it won't be photosynthesizing.
If they are not cold hardy, such a annual geraniums, bring them indoors and cut them back, but not all the way, and put them in a basement with some windows or another cool room with some light. Don't water them because you want them to go dormant. |