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Container Gardening: Winter Care
Winter care varies with climate and types of plants. Discard annual and temporary kinds and bring house plants indoors or to a greenhouse.
Palms, gardenias, and camellias in the South and yews, arborvitae, and pieris in the North can be left outdoors. In some cases, they will require shifting to less exposed spots and may even need covering with burlap, plastic film, or evergreen branches to guard against windburn or sunscald.
Spraying the tops of evergreens with plastic wax in the early winter will cut down on evaporation. Remember that container plants in the winter still need water, but if soil freezes hard, wait for periods of thaw.
Where temperature drops to zero and below, soil will freeze solidly and many hardy plants may be killed. This is due, not so much to cold, but to frozen soil, which doesnot allow tops to draw moisture, though they are still constantly transpiring. In below-zero regions, hardy evergreens, arborvitae, Japanese yew, hemlock, pines, and Douglas fir, if planted in containers with sufficient soil, will survive winters out of doors.
Where temperatures drop only to twenty degrees above, the choice of plant material is greater, extending to pieris, rhododendrons, azaleas, false cypress, firs, English and Korean boxwoods, cherry laurel, leucothoe, mahonia, and climbing euonymus.
English ivy, myrtle, and pachysan-dra are three low evergreens that are reliably hardy. For milder climates, with little or no freezing, the choice is almost limitless, including camellias, oleander, hibiscus, crotons, poinsettia, aucuba, pittosporum, nandina, podo-carpus, acacias, palms, bougainvillea, and ficus, not to mention many annuals.
From: Outdoor Gardening in Pots and Boxes
by: George Taloumis
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