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Some hardy perennials and shrubs can remain in outdoor pots through winter, but they generally need to be rated for conditions two hardiness zones colder than the gardener’s zone. Tender plants and vulnerable containers may need indoor shelter, while outdoor pots need drainage and occasional watering during dry spells.
Some potted perennials and shrubs can stay outdoors through winter, but their odds depend on plant hardiness, local conditions and the container, according to a gardening report by Veranda. The guidance advises choosing plants rated for conditions two hardiness zones colder than the gardener’s zone, because potting soil freezes and thaws more quickly than ground soil.
Annuals generally die after the first freeze, while tender perennials such as dahlias and canna lilies are unlikely to survive winter in pots in cold climates. The report says gardeners who want to keep these plants can wait until after the first frost, cut back dead foliage and store the tubers for spring, or move the entire pot to an unheated space such as a garage or basement.
Hardy perennials and shrubs may be left outside if they are suited to colder conditions than the local zone. As an example, the report says a gardener in zone 5 should look for plants hardy to zone 3 for the best chance of surviving in containers. A plant rated only one zone colder may need protection in an unheated sheltered space.
For plants left outdoors, the report recommends stopping fertilizer while plants are dormant but continuing to water when there has been no rain for a few weeks. Evergreens can lose moisture during winter, and soggy roots are also a risk. Pots should drain freely; raising them slightly on pot feet or a short stand can help. Ceramic, terra-cotta and porcelain containers are more prone to cold damage, while composite, wood, plastic and metal pots generally handle freezes better, though some plastics can split.
Cold Puts Roots and Pots at Risk
The distinction between a plant’s hardiness in the ground and in a container can determine whether it survives winter. Soil in pots is exposed on more sides and goes through more rapid freeze-thaw cycles than soil in the ground, which can stress roots. A plant that normally tolerates local winters may therefore need extra protection when its roots are in a pot.
Container material matters, too. A pot that cracks or flakes in freezing weather can be damaged even if the plant survives. Checking both the plant’s hardiness rating and the container before temperatures fall can help gardeners decide what to leave outside, shelter or store elsewhere.
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How Container Wintering Differs
Veranda’s report frames overwintering as a choice, not a requirement: gardeners can replace perennials in pots each year if they prefer. Some plants treated as annuals in colder regions, including lantana and dusty miller, are perennials in warmer climates, illustrating how strongly climate shapes the decision.
For plants that need protection, the report describes several options beyond moving a pot indoors. A manageable pot can be buried in the ground up to its rim and lifted out in spring. If that is not practical, placing it against a home—preferably near a south- or west-facing wall—and insulating the pot with blankets or frost covers may offer some protection. The report cautions that this approach is not foolproof.
“In general, it’s recommended that only plants that are two hardiness zones colder than your zone be kept in pots over the winter.”
— Veranda gardening report
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Winter Survival Varies by Conditions
The zone guideline is a general recommendation, not a guarantee that a plant will survive. Winter severity varies from year to year, and the report says warm-climate tender perennials may still be affected by how harsh a particular winter becomes. It does not provide survival rates for particular species, pot sizes or insulating methods.
Some choices also depend on practical details, including whether a pot is small enough to bury or move and whether a sheltered unheated space is available. The report notes that some plastic containers can split, but does not identify which types or conditions make that more likely. Local forecasts and plant-specific advice may help, but the outcome of a given winter cannot be assured.
insulated plant storage containers
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Prepare Pots Before Freezing Weather
Before sustained cold arrives, gardeners can check each plant’s hardiness against their local zone and decide whether to leave it outside, protect it or store it. Tender perennials intended for tuber storage should be handled after the first frost, according to the report. Pots made of ceramic, terra-cotta or porcelain should be moved to a protected location if outdoor freezing is expected.
For plants staying outside, gardeners can improve drainage, raise pots slightly and place them near a sheltered wall. They should monitor rainfall during dry spells and water as needed without leaving roots waterlogged. The report offers no fixed calendar date for these steps because appropriate timing depends on local weather.
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Key Questions
Can all potted plants stay outdoors in winter?
No. Annuals usually die after the first freeze, and tender perennials such as dahlias and canna lilies generally need storage or protection in cold climates. Some hardy perennials and shrubs may stay outside if suited to conditions colder than the local zone.
How cold-hardy should a potted plant be?
The Veranda report recommends choosing plants rated for two hardiness zones colder than the gardener’s zone. This is a rule of thumb, not a promise of survival.
Should outdoor pots be watered during winter?
Yes, if there has been no rain for a few weeks, the report says. Water sparingly: evergreens can lose moisture, but soggy roots can also be harmful, so pots need good drainage.
Which pots are most likely to crack in freezing weather?
Ceramic, terra-cotta and porcelain are identified as more vulnerable to cold damage. Composite, wood, metal and many plastic containers generally tolerate freezes better, although some plastic pots may split.
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