How to Winterize Geraniums in Pots? | Keep Them Alive Until Spring

Move potted geraniums indoors before the first hard frost, then choose between keeping them growing in bright light or storing them dormant in a cool, dark, frost-free space around 45-55°F.

One hard freeze turns a summer’s worth of healthy geraniums into brown mush. The solution is straightforward: bring them inside before frost hits and pick a storage method that matches your available space and light. Whether you have a bright windowsill or just a dark basement corner, you can keep those plants alive until next spring without buying new ones.

When to Bring Potted Geraniums Indoors

The window is narrow but predictable. Get your potted geraniums inside before the first hard frost of fall. A light frost might not kill them, but a hard freeze will. Watch your local forecast and plan to move pots indoors when nighttime temperatures are forecast to dip near or below freezing.

Before bringing them inside, inspect every plant for pests like aphids or whiteflies. Remove spent flowers, yellowing leaves, and any damaged stems. This cleanup reduces the chance of bringing problems into your home or storage area and gives the plant a cleaner start to its rest period.

Three Ways to Overwinter Potted Geraniums

Your choice depends entirely on what you have to work with. If you have a sunny window, keep them growing. If you only have a dark basement or garage, store them dormant.

Method 1: Keep Them Growing Indoors

Place the pots in the sunniest window you have, ideally south-facing, or under artificial grow lights on a 12-14 hour timer. Water much less than you did outdoors — let the top inch of soil dry out before watering again. The reduced light and shorter days mean the plant needs far less moisture.

Indoor geraniums tend to get leggy by late winter because light levels are lower. Pinch back any stretched growth to keep the plant compact, and cut the plant back by about half in late March to encourage bushy new growth.

Method 2: Store Dormant in a Cool, Dark Space

This is the most space-efficient method and works well for gardeners with basements, crawl spaces, or attached garages that stay above freezing. The ideal temperature range is between 45°F and 55°F — cool enough to keep the plant asleep but above freezing.

Cut the plant back by roughly one-half, removing all flowers and buds. Leave about 4-6 inches of stem. Let the soil dry out, then place the pot in an open paper bag or cardboard box. Plastic bags can trap moisture and cause rot, so stick with breathable materials.

Check your stored geraniums about once a month. If the stems start shriveling, give the roots a light soak for an hour or two, then let them dry again before returning to storage. The Iowa State University Extension recommends soaking the roots in water for 1-2 hours, two or three times over the winter. Overwatering during dormancy is the most common way to kill stored geraniums, so err on the dry side.

If you want to save space, you can also remove the plant from its pot, shake off most of the soil, and hang it upside down in the cool, dark space. This bare-root method works the same way and lets you stack multiple plants in a small area.

Method 3: Take Cuttings and Refresh in Spring

This approach works when you have limited indoor space but still want to preserve your plant variety. In late summer or early fall, take 3- to 5-inch stem cuttings from healthy plants, remove the lower leaves, and root them in water or moist potting mix. Keep the rooted cuttings in a bright indoor spot over winter, then pot them up in spring.

You skip the bulk of full pots and end up with compact, young plants that grow vigorously when moved outdoors after the last frost. The trade-off is that the cuttings need consistent light and moisture through the darker months.

Waking Them Up in Spring

About 6 to 8 weeks before your area’s last expected frost date, bring dormant plants out of storage. Repot them in fresh potting mix, water thoroughly, and move them to a bright, warm location. Trim away any dead or mushy stems — healthy stems will be firm and pale green inside.

Once the plants start showing new growth, resume normal watering and light fertilization. After the danger of frost has passed, harden them off by moving the pots outdoors for a few hours each day over 7-10 days. Start in shade and gradually introduce more sun to prevent leaf burn.

For a broader look at the best containers for growing geraniums next season, our roundup of top-rated geranium window boxes covers durable options that handle outdoor conditions well.