Pelargonium Care and Overwintering: How to Keep the Same Plant for Years

What potting mix and container does a pelargonium need?

Use a peat-free, well-draining potting mix formulated for containers, not garden soil straight from a bed. Garden soil compacts hard in a pot and drains poorly, which slowly suffocates the roots – a problem that gets worse over winter, when watering is deliberately kept light. The same logic applies whether you're growing vegetables in pots or flowering container plants: container size and mix quality matter as much as day-to-day care.

A medium pot, roughly 6–8 inches (15–20 cm) across, suits most mature plants. An oversized pot holds onto moisture longer than the roots can use, which raises the risk of rot, especially in winter when growth has almost stopped. Young plants and freshly rooted cuttings should start in something smaller and move up as they fill the pot.

Drainage holes are non-negotiable. Without them, water pools at the base and roots are starved of oxygen – a problem that shows up fastest under the restrained winter watering schedule described later in this guide. Material matters too: plastic pots hold moisture longer and weigh less, useful on a balcony with a weight limit, while terracotta breathes more and dries faster but delivers better airflow to the roots.

Repotting isn't an annual job. Refreshing the mix every two to three years, or whenever a plant is clearly rootbound, is usually enough. Spring is the best time, right as plants come out of storage and before they put on serious new growth.

Good to know. Self-watering pots with a built-in reservoir can help during the growing season if you tend to forget watering or travel often – they even out moisture far better than a standard pot. Just empty the reservoir completely before winter storage; a pelargonium should never sit with wet roots during its cool rest.

Pelargonium or geranium – are they the same plant?

In everyday conversation, yes – "geranium" almost always means pelargonium, the tender, frost-sensitive plant this guide is about. Botanically, though, the two are different genera. True Geranium species, commonly called hardy geraniums or cranesbills, are winter-hardy perennials that stay in the border year after year with no protection at all, unlike the pelargoniums covered here.

The confusion goes back centuries: early botanists classified both under the same genus before splitting them apart, and the common name never really caught up. If a plant needs to come indoors before frost, has thick, fleshy stems and rounded, often zoned leaves, and flowers non-stop through summer, you're almost certainly dealing with a pelargonium. A true hardy geranium looks different – more delicate foliage, smaller flowers, and no need to be rescued before the first cold snap, much like the winter-hardy options in a perennials border that need no protection at all.

The practical upshot: when you search "geranium care" and land on advice about overwintering indoors, it's almost certainly about pelargoniums. But it's worth double-checking against photos before following storage instructions, since an actual hardy geranium neither needs nor benefits from being dug up and kept in the dark.

How do you care for pelargoniums through the growing season?

Pelargoniums flower best in full sun – six or more hours a day is ideal on a south- or west-facing spot, which makes them one of the most reliable choices for a balcony or patio container. Regal pelargoniums (sometimes sold as "Martha Washington" types) are the exception; they actually prefer some shade during the hottest part of the day. Every other type blooms more sparsely the more shade it gets. If you're still weighing up what else to grow in the same space, a rundown of what grows well on a balcony can help you prioritise between sun-hungry plants like pelargoniums and things that tolerate more shade.

Water once the top couple of inches of compost feel dry rather than on a fixed schedule. Pelargoniums handle drought well but resent sitting wet, and compost that stays soggy for extended periods causes far more root rot than an occasional missed watering. During peak summer heat, a container in full sun and wind can need daily watering; in spring and autumn, twice a week is often plenty.

Feed weekly from spring through midsummer with a fertiliser labelled for flowering container plants, then taper off as summer winds down. Stopping fertiliser in good time before autumn isn't just tidy housekeeping – it helps the plant ease into dormancy instead of pushing soft new growth that's especially vulnerable to cold and disease once it's in winter storage.

Deadhead spent flowers and remove yellowing leaves as you go. It's a small habit that pays off: a plant left to set seed puts energy into that instead of new buds, and dense, damp foliage full of spent blooms is exactly where grey mould gets started.

Good to know. Pinch the growing tips of young plants a few times in late spring. It makes the plant bushier and produces more flowering stems instead of one tall, sparse one – especially noticeable on plants grown from cuttings or seed.

When should you bring pelargoniums indoors for winter?

Bring pelargoniums in before the first hard frost, not after. Plants show visible damage at temperatures just above freezing, and one real frost can kill an outdoor plant outright. Because frost timing shifts considerably depending on where you garden and how that particular autumn plays out, there's no single date that works everywhere – start watching the forecast in late summer and act earlier the further north or higher in elevation you are.

Let the compost dry out somewhat before the move indoors – wet compost combined with warmer indoor air is close to ideal conditions for fungal problems and pests. While you're at it, check the plant carefully for aphids, spider mites and other hitchhikers, which spread fast once they're inside in warm, dry air.

If you have a three-season porch, enclosed sunroom or unheated greenhouse that stays reliably above freezing, pelargoniums can often stay there far longer than in the open garden. A frost-free greenhouse is a genuinely good option for bright, cool storage if you already have one.

How to overwinter pelargoniums step by step

1. Remove spent flowers and damaged leaves. Less wet plant material means less chance of mould developing in storage.
2. Let the compost dry out somewhat first. A plant that goes into storage on the dry side handles cool, dark conditions far better than one that's waterlogged.
3. Check for pests. Aphids and spider mites multiply fast indoors – deal with an infestation before the move, not after.
4. Cut the plant back to about 4 inches (10 cm) if it's going into dark or cramped storage. For bright, cool storage, removing just the leggiest growth is often enough.
5. Move to a frost-free spot at 40–50°F (5–10°C). A garage, unheated basement, enclosed porch or cool hallway all work, as long as it never drops below freezing.
6. Water sparingly all winter. Roughly once a month for dark, cool storage – less often than most people expect.
7. Check on plants periodically. Look for mould, overly dry compost or signs of shrivelling, and adjust watering or placement as needed.

Common mistake. Watering an overwintering pelargonium roughly the way you would in summer. The plant barely grows during winter dormancy and can't take up water at anywhere near the same rate – overwatering combined with cool, dark conditions is the single biggest reason overwintered pelargoniums rot and die.

Which overwintering method suits your type?

Not every pelargonium handles the same storage equally well. Zonal pelargoniums, the common type with distinctly marked leaves, are the most forgiving and can rest almost completely dormant in dark, cool storage. Scented-leaf, regal and trailing (ivy-leaved) types are much less tolerant of darkness and need considerably more light to avoid fading away over winter.

Dark and cool (40–50°F / 5–10°C). Best for zonal types. Prune hard, store in a garage, basement or dark hallway closet, and water no more than monthly. The plant will drop most of its leaves, which is entirely normal as long as the stems stay green and firm.

Bright and cool (40–50°F, up to about 60°F / 5–15°C). Best for scented, regal and trailing types. An unheated but frost-free sunroom, enclosed porch or a cool room with a north-facing window all work. Water every three to four weeks, less often than summer but more than dark storage.

Room temperature on a windowsill. Works, but plants easily turn leggy and thin without enough winter light, since short winter day length rarely provides enough for compact growth. Supplemental grow lights running 12–14 hours a day make a real difference if you're keeping several plants and want to avoid long, weak stems.

How to wake pelargoniums up in spring

From late February into March, as daylight starts returning in earnest, it's time to gradually bring plants back to life. Move them somewhere brighter and slightly warmer, and start watering a little more often as the compost begins drying out faster.

Prune away weak, thin or dead growth at the same time. This pushes strong new growth from the healthy buds lower on the stem instead of the plant wasting energy on pale, winter-stressed shoots that rarely flower well anyway. A plant that's been in dark storage all winter can look fairly rough by this point – a hard cut back is rarely a mistake.

Repot into fresh potting mix if a plant has been in the same container more than one season or the existing mix looks spent. Hold off on fertilising for a couple of weeks after repotting, then start with a diluted feed and increase strength as the plant shows clear new growth.

Don't move plants outdoors permanently until frost risk has passed for your zone – the same timing as bringing them in, in reverse. Harden plants off gradually over a week, adding an hour or two outdoors each day, before the final move. A plant that goes straight from a warm windowsill to a cold night outside often suffers even without an actual frost.

Roughly, the year looks like this for a pelargonium kept going long-term: late February to March, wake the plant with more light and a first light prune; April, repot if needed; May, move outdoors once frost risk has passed and ramp up feeding; June through August, peak season with frequent watering and weekly feeding; September, taper off fertiliser and start watching the forecast; October is typically when plants come back indoors and get cut back for storage.

Why is my overwintered pelargonium dropping leaves or wilting?

Most winter storage problems trace back to an imbalance between water, light and temperature – and most are fixable the same winter if you catch them early.

The plant drops most of its leaves in dark storage. Completely normal. A zonal pelargonium kept dark and cool goes nearly dormant and manages fine without leaves as long as the stems are still green and firm to a light squeeze. Shrivelled, brown stems, on the other hand, mean the plant has dried out too much.

Stems turn soft, dark or mushy. A sign of rot, almost always from too much moisture combined with poor air circulation. Cut away affected sections immediately with clean secateurs, move the plant somewhere drier and airier, and cut back on watering further.

Grey, fuzzy mould on leaves or stems. Grey mould (botrytis), which thrives in still, damp air and dense foliage. Increase airflow, remove affected parts, and avoid wetting the leaves when you water. It spreads quickly between plants stored close together, so isolate an affected one if you can.

The plant looks tall, pale and leggy. Almost always too little light relative to the storage temperature. The warmer a plant is kept, the more light it needs to stay compact. Move it somewhere cooler or brighter, and prune the weak growth back hard in spring – it rarely flowers well anyway.

Sticky leaves or tiny white flies. Whitefly and aphids thrive in dry, warm indoor air over winter, especially on plants already stressed by low light. Rinse the plant with lukewarm water or use an insecticidal soap, and check regularly so an infestation doesn't spread to other houseplants nearby.

The plant loses vigor even though it still looks fine above the soil line. Check the roots if you can. Vine weevil larvae are less common than aphids but do turn up in container-grown pelargoniums, and the damage often isn't obvious until the plant is already struggling. If the potting mix is full of small, comma-shaped white grubs, the plant is rarely worth saving – discard the mix and clean the pot thoroughly before reusing it.

Common mistake. Panic-watering a sad-looking pelargonium in February. Most tired-looking overwintered plants at that point suffer from too little light, not too little water – extra water won't fix that and only raises the risk of rot.

How to propagate pelargoniums from cuttings

Taking cuttings is the easiest way to get more plants without buying new ones, and it's also a good option if a mother plant is simply too big to overwinter whole. Late summer to early autumn works best, though cuttings taken from plants that have already woken up in spring will root too.

1. Cut a healthy shoot tip, about 3–4 inches (8–10 cm) long. Make the cut just below a leaf node with clean, sharp secateurs or a knife.
2. Strip the lower leaves so only a couple remain at the top of the cutting.
3. Let the cut end dry for an hour or so before planting. Pelargoniums are prone to rot at a fresh, open cut if it goes straight into damp mix.
4. Plant in light, well-draining potting mix, ideally with some added sand or perlite for extra drainage.
5. Place somewhere bright but out of direct, intense sun, and keep the mix lightly moist without ever letting it turn soggy.
6. Wait for roots to form, which usually takes a few weeks. A slight resistance when you gently tug the cutting is a good sign it has rooted.

Cuttings taken in August or September usually have time to root and get established before winter, giving a noticeably stronger plant by spring than one started in February. Growing from seed is possible too, but expect roughly 15 weeks from sowing to first flower, and named cultivars rarely come true from seed – cuttings are the better route if you want to keep an exact variety going.

Common pelargonium mistakes

• Waiting too long to bring plants in. A single cold night is enough to damage or kill a pelargonium left outside past its frost date.
• Storing too warm without enough light. Produces pale, leggy growth that rarely flowers well even after spring pruning.
• Watering as usual through winter dormancy. The most common reason overwintered pelargoniums rot.
• Skipping the pre-storage cutback. Wastes storage space and raises the risk of mould in dense, untrimmed foliage.
• Moving plants outside too early without hardening off. A late frost can undo a whole winter's worth of careful storage.
• Treating every type the same way. A scented-leaf pelargonium stored as dark as a zonal type often fades away completely by spring.

Frequently asked questions

How cold can pelargoniums tolerate before they're damaged?
Pelargoniums start showing damage at temperatures just above freezing and generally don't survive a real frost. Bring them indoors before frost becomes a realistic risk in your area rather than waiting to see what the forecast actually brings once the nights turn cold.

Do pelargoniums need to come indoors for winter everywhere?
Outside the warmest climates – roughly USDA zone 10 and up – yes. Pelargoniums aren't winter-hardy through zones 3–6 and won't survive left outside. If you want the same plant back next year, it needs a frost-free spot indoors, in a porch, or in a greenhouse kept above freezing.

Can pelargoniums overwinter in an unheated sunroom or enclosed porch?
Yes, as long as the space stays frost-free and ideally around 40–50°F (5–10°C). A cool but insulated porch or sunroom often works better than a warm, heated room, since it gives the plant the cool rest period it actually needs without risking frost damage.

How often should pelargoniums be watered during winter storage?
In dark, cool storage, roughly once a month is usually enough. In brighter, slightly warmer storage, water every three to four weeks instead. Always let the compost dry out almost completely between waterings, and check plants periodically for shrivelling rather than watering on a fixed schedule.

Why is my pelargonium dropping all its leaves in storage?
If it's stored dark and cool, leaf drop is completely normal and simply means the plant has gone dormant. Check that the stems are still green and firm – that's the real sign of health, even though the plant looks bare. Shrivelled, brown stems mean it has dried out too much.

When should I cut pelargoniums back before winter?
At the same time you bring them indoors, especially if they're going into dark or cramped storage. Cut back to roughly 4 inches (10 cm). Types kept in bright, cool storage, like scented-leaf and regal pelargoniums, often only need the leggiest growth removed.

Can I overwinter pelargoniums in a small apartment with no basement or garage?
It's harder, since most apartments lack a reliably cool, frost-free space. A cold north-facing windowsill or an unheated closet can work for a few plants, but it's often simpler to take cuttings in late summer and overwinter the smaller cutting plants on a bright windowsill instead of the whole mother plant.

How do you propagate pelargoniums from cuttings?
Cut a healthy shoot tip about 3–4 inches (8–10 cm) long, strip the lower leaves, let the cut end dry for an hour, then plant it in light, well-draining mix. Keep it lightly moist and out of direct, intense sun. Rooting usually takes a few weeks.

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