Every November, right about the time the wind starts rattling the porch screen and the last of the maple leaves gather in the fence rows, I start thinking about my geraniums. Folks around here sometimes treat them like throwaway summer flowers, but I never have. My mother saved hers, my grandmother saved hers, and I’ve done the same for more than 40 years. If you take a little time before a hard freeze, those same plants can come back stronger, fuller, and downright glorious next summer.
The trick is not simply hauling the pots indoors and hoping for the best. Geraniums need a proper November plan: the right timing, a good cleanup, sensible pruning, careful storage, and steady winter attention. I’m going to walk you through the whole process step by step, including what temperature to aim for, how much to cut back, where to store them, and how to wake them up in late winter so they reward you with armfuls of blooms.
1. Move before the first hard freeze, not after
Geraniums can tolerate a light chill, but a hard freeze will damage stems and leaves in a hurry. In my part of the Midwest, I try to bring them in when nighttime temperatures start dipping to 38 to 40 degrees Fahrenheit regularly, and absolutely before the forecast calls for 32 degrees or lower. If you wait until the plants look blackened or mushy, you’re already behind.
I like to do this job in mid-to-late November, depending on the year. Watch the 10-day forecast and act early. A healthy plant that comes indoors before freezing has a far better chance of surviving winter and blooming heavily the next season than one rescued after a cold snap.
2. Decide which overwintering method fits your space
There are three dependable ways to overwinter geraniums, and the best one depends on what kind of room you have. The first is keeping them as active houseplants in bright light. The second is storing them semi-dormant in pots in a cool place. The third is the old-fashioned bare-root method, where you lift the plants, shake off the soil, and store them dry in a cool, dark location.
If you have a sunny south-facing window or grow lights, active growth is a fine choice. If you have a cool basement room, enclosed porch, or unheated spare room that stays between 45 and 55 degrees Fahrenheit, semi-dormant storage works beautifully. And if you’re short on windowsill space but have an old cellar or garage that stays just above freezing, the bare-root method can save a lot of plants in very little room. I’ve used all three over the years, though I still have a soft spot for the bare-root method because that’s how my grandmother did it with newspaper and brown paper sacks.
3. Inspect every plant closely and only save the healthiest ones
Before you bring anything indoors, inspect every stem, leaf, and the soil surface. Look for yellowing leaves, black stems, mushy spots, whiteflies, aphids, spider mites, fungus gnats, or powdery mildew. One sick plant can turn into a winter-long headache once it’s inside with your other houseplants.
I’m practical about this. If a geranium is weak, woody, badly diseased, or barely blooming by fall, I compost it rather than fuss over it all winter. Save the best performers: sturdy stems, good leaf color, no insect damage, and a strong root system. Those are the plants most likely to reward you next July with dense heads of flowers instead of a few tired blossoms.
4. Wash pots and clean up the plants thoroughly
This is one of those unglamorous chores that makes a world of difference. Remove all spent blooms, dead leaves, fallen debris, and any weeds growing in the pot. If the outside of the container is muddy or crusted with mineral buildup, wash it down. Clean pots reduce the chance of carrying insects, fungal spores, and rot indoors.
If you’re repotting, scrub used pots with warm water and a little dish soap, then sanitize them in a solution of 1 part household bleach to 9 parts water for 10 minutes. Rinse well and let them dry. It sounds fussy, but I’ve learned that November cleanliness saves a lot of January disappointment.
5. Cut the plants back by one-third to one-half
Geraniums overwinter better when they aren’t carrying a big mass of lanky stems and soft growth. I cut mine back by about one-third for plants I plan to keep actively growing indoors, and by one-half for plants going into cooler, semi-dormant storage. Use clean pruners and make cuts just above a leaf node.
For most potted geraniums, that means reducing a 12- to 18-inch plant down to about 6 to 10 inches tall. Remove weak, crossing, or spindly stems altogether. This pruning helps the plant conserve energy, improves air circulation, and encourages bushier growth later. Don’t be timid. Geraniums are tougher than they look, and a sensible haircut now usually means a fuller plant by spring.
6. Rinse the foliage and treat pests before the plants come inside
Even if the leaves look clean, I always assume a few hitchhikers are hiding under them. Start by spraying the plant thoroughly with a gentle stream of water, especially the undersides of leaves and the leaf joints where insects like to hide. Let the plant drip dry in a sheltered spot.
After that, treat with insecticidal soap or neem oil according to the label. Be thorough but not heavy-handed. Apply in the morning or late afternoon, never in harsh sun, and let the plant dry before bringing it indoors. Then isolate newly brought-in geraniums from your other houseplants for 7 to 10 days if you can. That small quarantine can prevent a whole-house infestation in winter.
7. Refresh the soil if it is compacted, exhausted, or sour-smelling
Geraniums hate sitting in tired, waterlogged potting mix all winter. If the soil is compacted, crusted, or has a stale smell, repot before storage. Choose a container only 1 to 2 inches wider than the root ball. Too much extra soil stays wet too long, and wet roots in winter are asking for trouble.
Use a light potting mix, not garden soil. I like a plain indoor potting mix with added perlite so water drains well. Geraniums prefer a slightly crowded pot and good drainage. Make sure every container has a drainage hole. If roots are tightly circling the pot, tease them loose a bit before replanting. Water once to settle the soil, then let the top inch dry before watering again.
8. Match light and temperature to the storage method you chose
If you are keeping geraniums growing indoors, give them as much light as possible. A south- or west-facing window is ideal, and 6 to 8 hours of bright light per day is a good target. If your winter light is weak, a simple LED grow light kept 6 to 12 inches above the foliage for 12 to 14 hours daily can keep plants compact and healthy.
For active indoor growth, aim for daytime temperatures between 60 and 70 degrees Fahrenheit and nighttime temperatures around 55 to 60. For semi-dormant storage in pots, cooler is better: 45 to 55 degrees Fahrenheit with bright but indirect light. For bare-root storage, darkness is fine, and temperatures between 40 and 50 degrees Fahrenheit are usually ideal. The one thing geraniums do not appreciate is a warm, dim room. That combination almost always leads to pale, stretched, unhappy plants.
9. Water far less than you do in summer
This is where many gardeners love their geraniums to death. In winter, they use much less water, and soggy roots quickly rot. For actively growing indoor plants, water when the top 1 to 2 inches of soil feel dry. In many homes, that may be every 7 to 14 days, though it varies with pot size, light, and humidity.
For semi-dormant potted geraniums, water just enough to keep the roots from shriveling completely, often every 2 to 3 weeks. For bare-root plants, inspect them once a month. If stems are becoming deeply shriveled, lightly mist the roots or wrap them briefly in barely damp paper before returning them to storage. The goal is not active growth; it is survival without rot. When in doubt, wait another day before watering.
10. Do not feed heavily through the darkest part of winter
Fresh fertilizer in November and December usually pushes weak, leggy growth, especially in northern climates where daylight is short. I stop regular feeding when I bring geraniums in and hold off through much of winter. If a plant is actively growing under strong light, you can give it a half-strength balanced liquid fertilizer once every 4 to 6 weeks, but no more than that.
For plants in cool storage or bare-root storage, skip fertilizer entirely until late winter or early spring. Feeding at the wrong time won’t create more flowers. It just creates soft growth that struggles with low light and can invite pests and disease.
11. Check the plants every week for mold, pests, and rot
Overwintering is not a “put them away and forget them” business. Once a week, take 5 minutes to inspect leaves, stems, and soil. Look for gray mold, yellowing leaves, fungus gnats, sticky residue, or blackened stem bases. Pinch off anything damaged immediately and improve airflow around the plants if you see moisture lingering.
I also rotate pots every few days if they’re in a window so they don’t lean hard toward the light. If you notice soft, rotting stems, cut back to healthy tissue with clean shears. If pests reappear, treat right away before numbers build. Small problems stay small if you catch them in December; they become aggravations by February.
12. Use the old-fashioned bare-root method if you have lots of plants
If you’ve got a porch full of geraniums and not much indoor space, the bare-root method is wonderfully practical. Dig up the plant before a hard freeze, shake off as much soil as possible, and trim it back by about one-third to one-half. Let the roots air-dry for a few hours in a sheltered place.
Then place each plant upside down or loosely wrapped in newspaper inside a paper bag or cardboard box. Store them in a cool, dark location at 40 to 50 degrees Fahrenheit. Check them once a month. If they become very shriveled, soak the roots in lukewarm water for 1 to 2 hours, let them dry slightly, and return them to storage. About 6 to 8 weeks before your last spring frost date, pot them up, water lightly, and place them in bright light to wake them up.
13. Start waking them up in late winter for bigger summer bloom
If you want truly abundant flowers by early summer, don’t wait until planting time to think about spring care. About 8 weeks before your average last frost, move stored plants to brighter light and slightly warmer conditions. For many Midwestern gardens, that means sometime in late February through March.
At that point, repot if needed, trim back any winter-weakened stems, and resume light watering. Once you see fresh growth, begin feeding with a balanced fertilizer at half strength every 2 weeks, or use a bloom-supporting formula according to package directions. Pinch the growing tips once or twice before May to encourage branching. More branches mean more flowering stems, and more flowering stems mean the kind of geranium display that makes the front porch look cheerful from the road.
14. Harden them off slowly before they go back outside
One of the biggest mistakes I see is putting overwintered geraniums straight out into full sun and spring wind. After months indoors, those leaves are tender. Start hardening them off 7 to 10 days before planting out. Set them outside in a sheltered, shaded spot for 2 to 3 hours the first day, then increase the time daily and gradually introduce morning sun.
Bring them in if temperatures drop below 45 degrees Fahrenheit. By the end of the hardening-off period, they should tolerate a full day outdoors. This simple step prevents sunscald, wind damage, and setback. A plant that transitions gently keeps its momentum and gets on with the business of blooming.
15. Know the few mistakes that ruin next year’s flowers
If I could spare every gardener three common troubles, I would. First, do not bring in bug-ridden plants without cleaning them. Second, do not keep geraniums too wet in winter. Third, do not store them in a hot room with poor light. Those three mistakes cause most winter losses and most disappointing summer performance.
The other issue is waiting too long in spring. Geraniums that are revived early, pinched once or twice, and fed modestly will usually flower much more heavily than plants that are left neglected until May. Overwintering isn’t difficult, but it does reward steady attention.
There’s something deeply satisfying about carrying a living bit of summer through the dark months and setting it back on the porch when the world greens up again. By July, when those saved geraniums are mounded up and blooming their heads off in red, coral, salmon, or pink, I always feel like I’ve kept a small promise to the women who taught me how to garden.
And if you ask me, that’s part of the pleasure of it. November may look like the end of the season, but for geraniums it is really the beginning of next summer’s show. Do these jobs carefully now, and you won’t just save your plants—you’ll set them up for the kind of massive bloom that stops folks on the walkway and makes them ask, “How on earth did you get them so full?”