Plants in containers face winter with no blanket of soil around their roots. That makes them far more vulnerable than the same plants growing in the ground. Learning how to overwinter potted plants lets you save favorites, from geraniums to patio shrubs, instead of buying new ones every spring.
The right way to overwinter potted plants depends on what the plant is and how cold your winters get.
Why Pots Need Extra Protection
Roots are much less cold-hardy than stems and branches. In the ground, soil insulates them. In a pot, roots sit inches from freezing air on every side. A common rule is that a potted plant should be hardy to two zones colder than where you live if it’s going to stay outside unprotected. For example, in zone 6 you’d want a plant rated to zone 4.
Not sure of your zone? Check the USDA Plant Hardiness Zone Map.
Sort Your Plants First
- Tender perennials: Geraniums, fuchsias, mandevilla, and begonias die at the first frost but can live for years indoors.
- Tropicals and houseplants: Hibiscus, citrus, and anything that summered outdoors must come inside before nights dip into the 40s °F.
- Hardy shrubs and perennials in pots: Hydrangeas, boxwood, hostas, and grasses can stay outdoors with some protection.
- Annuals: Petunias and most bedding plants aren’t worth saving. Compost them.
How to Overwinter Potted Plants: 4 Methods
1. Bring Them Inside as Houseplants
This works for tropicals, citrus, and herbs like rosemary. Before moving them, rinse leaves with a hose and check for insects under the leaves. Then place them in your brightest window, away from heat vents. Expect some leaf drop as they adjust. Water less often, since growth slows in low winter light. The same watering rules from our snake plant care guide apply: let the top of the soil dry out first.
2. Store Them Dormant
Many tender plants can sleep through winter in a cool, dark space between 35 and 50°F. A basement, crawl space, or attached garage works.
- Cut plants back by about half.
- Water lightly once a month so roots don’t dry out completely.
- Bring them into the light in early spring, about six weeks before your last frost.
Geraniums are famous for this. Some gardeners even pull them from the pot, shake off the soil, and hang them upside down in paper bags.
3. Take Cuttings
Instead of saving a big plant, root a few 4-inch stem cuttings in small pots on a windowsill. Coleus, geraniums, and sweet potato vine root easily in water or moist mix. You’ll have compact young plants for spring.
4. Protect Them Outdoors
For hardy plants that stay outside:
- Group pots together against a north or east wall, out of winter sun and wind.
- Wrap pots in burlap or bubble wrap, or bury them in a pile of shredded leaves.
- Raise pots on feet so they don’t freeze to the ground or sit in water.
- Water before the ground freezes and during winter thaws.
Watch the Container Itself
Terra-cotta and ceramic pots can crack when wet soil freezes and expands. Empty them or move them into a garage. In contrast, plastic, fiberglass, and thick concrete pots usually handle freezing.
When to Act
If you want to overwinter potted plants successfully, bring tender ones in before the first frost, usually when nights reach the mid-40s °F. Waiting until after frost often means damaged leaves and stressed plants. If you’re already working through a winter home checklist, add your potted plants to it.
South American Gardeners
In places with mild winters, like coastal Brazil or Colombia’s lowlands, most potted plants stay outside year-round. However, in Patagonia, the Andes, and southern Chile, winter frosts are real. The same methods apply, typically between May and September.
FAQ
Can I keep potted plants in an unheated garage?
Yes, if it stays above about 20°F for hardy plants or above 35°F for dormant tender plants.
Do dormant plants need light?
No. Dormant plants can stay in the dark until spring.
Why are leaves dropping indoors?
Lower light and dry indoor air cause some leaf drop. New leaves usually grow as the plant adjusts.
