How To Overwinter Geraniums – Save Your Favorite Blooms For Next
We’ve all been there: the first frost is looming, and your vibrant geraniums are still putting on a spectacular show in your garden beds. It feels like a heartbreak to let these hardy, cheerful plants succumb to the winter chill when they have so much life left in them.
The good news is that you don’t have to say goodbye to your favorite flowers just because the seasons are changing. Learning how to overwinter geraniums is a simple, rewarding skill that saves you money and gives you a head start on a lush garden next spring.
In this guide, I will walk you through the most effective methods to keep your plants safe, from keeping them as houseplants to the traditional bare-root storage technique. By the time we’re done, you’ll feel like a pro ready to tackle the cold with confidence.
Why You Should Save Your Geraniums Every Year
Geraniums, specifically the Pelargonium species most of us grow, are actually tender perennials rather than annuals. This means they can live for many years if they are protected from freezing temperatures.
One of the biggest benefits of keeping your plants is the size. A second-year or third-year geranium is significantly larger and more robust than the small starts you buy at the nursery in May.
Saving your plants also allows you to preserve specific colors or varieties that might be hard to find again. Plus, it is a fantastic way to practice sustainable gardening by reducing plastic pot waste and transport emissions.
Finally, there is a certain sense of pride that comes with “waking up” a plant you’ve cared for through the dark winter months. It makes the first bloom of spring feel even more like a personal victory.
A Step-by-Step Guide on how to overwinter geraniums
Before you start, you need to decide which method fits your home and lifestyle. There are three primary ways to handle this process, and each has its own set of requirements for light and space.
The most important factor across all methods is timing. You must bring your plants indoors before the first hard frost hits your region, as a deep freeze will turn the stems to mush.
If the forecast calls for temperatures below 40°F (4°C), it is time to act. Even if the plant looks healthy, the internal cell structure starts to struggle once the ground begins to chill.
Preparing Your Plants for the Transition
Regardless of the method you choose, you need to prepare the plant first. Start by inspecting the foliage for any signs of pests or disease like aphids, whiteflies, or rust.
You don’t want to bring unwanted guests into your home or storage area. Give the plants a gentle spray with a hose to knock off any lingering insects a few days before you move them.
Next, trim back the plant by about one-third. This reduces the stress on the root system and makes the plant more manageable to move and store during the dormant months.
Method 1: Keeping Geraniums as Active Houseplants
This is the most popular method for gardeners who have a sunny windowsill or a heated sunroom. It allows you to enjoy the vibrant green foliage all winter long, even if the plant isn’t blooming.
To do this, carefully dig up your geraniums and place them in pots with fresh, well-draining potting soil. Make sure the pots have adequate drainage holes to prevent root rot.
Once potted, move them to the brightest spot in your home. A south-facing window is ideal, as geraniums need at least six to eight hours of light to stay healthy.
Managing Light and Water Indoors
Indoors, the air is often much drier than outside. You will need to monitor the soil moisture closely, but be careful not to overwater, which is the leading cause of death for indoor geraniums.
Wait until the top inch of soil feels dry to the touch before adding water. During the winter, the plant’s growth slows down, so it requires much less hydration than it did in the summer heat.
If your home lacks natural light, you can use LED grow lights. Position the lights about 6-12 inches above the plants and keep them on for 12 hours a day to mimic a summer cycle.
Pruning for Compact Growth
Indoor geraniums can sometimes become “leggy” or stretched out as they reach for the light. To prevent this, don’t be afraid to pinch back the growing tips periodically.
Pinching encourages the plant to branch out, resulting in a bushier, more attractive shape. If you see flower buds forming, you might want to remove them to let the plant focus on root health.
However, if your plant is thriving and you want a splash of color, feel free to let it bloom! Just remember that indoor blooms are often smaller and less intense than outdoor ones.
Method 2: The Bare-Root Storage Technique
This is a classic “old-school” way to handle the process. This is the classic way people think of when they ask how to overwinter geraniums in a cellar or basement without using pots.
This method is perfect if you have dozens of plants and limited windowsill space. It relies on putting the plant into a state of deep dormancy where it essentially sleeps through the winter.
Start by digging up the plant and gently shaking off all the excess soil from the roots. You want the roots to be relatively clean but be careful not to snap the main root ball.
Storing in Paper Bags or Boxes
Place the bare-root plants upside down inside a large paper grocery bag or a cardboard box. Do not use plastic bags, as these trap moisture and will cause the plants to rot within weeks.
Store the bags in a cool, dark, and dry place. An unheated basement, a crawl space, or a frost-free garage works perfectly. The temperature should stay between 45°F and 50°F.
Every few weeks, take the plants out and inspect them. If the stems feel extremely shriveled or brittle, you can soak the roots in lukewarm water for an hour before letting them dry and returning them to storage.
Managing Foliage Loss
Don’t be alarmed when the leaves turn yellow and fall off during bare-root storage. This is a natural part of the dormancy process as the plant pulls energy back into the stems.
You can gently pull off the dead leaves to keep the storage area clean. If you see any mold or fuzzy growth, discard that plant immediately so it doesn’t infect the others.
By late winter, the stems may look like dead sticks, but as long as they are firm and not mushy, the “heart” of the plant is still very much alive and waiting for spring.
Method 3: Taking Cuttings for New Plants
If your original plants are too large to bring inside, taking cuttings is a brilliant way to “reset” your garden. This creates clones of your favorite plants that are much easier to manage.
Using a clean, sharp knife or garden snips, cut a 4-to-6-inch piece of a healthy stem. Make the cut just below a node, which is the bump where a leaf meets the stem.
Remove the lower leaves, leaving only two or three at the very top. This ensures the cutting doesn’t lose too much moisture through transpiration while it tries to grow new roots.
Rooting Your Cuttings
You can root geranium cuttings in either water or a light potting mix. While water is fun to watch, rooting in soil often produces stronger root systems that transition better to the garden.
Dip the end of the cutting in rooting hormone if you have it, though geraniums are so hardy they often root just fine without it. Stick the cutting into a small pot of moist perlite or sand.
Keep the cuttings in a warm spot with indirect light. In about three to four weeks, you can give them a gentle tug; if you feel resistance, you know the roots have successfully formed.
Common Problems and How to Solve Them
The biggest enemy during the winter months is excessive moisture. Because the air is cooler and the plants are less active, water doesn’t evaporate as quickly as it does in July.
If you notice the stems turning black at the base, this is a sign of “Black Leg” or fungal rot. Unfortunately, there is no cure for this, so you must remove and discard the affected plants.
Another common issue is the fungus gnat. These tiny black flies thrive in moist soil. To get rid of them, allow the soil to dry out completely and use yellow sticky traps to catch the adults.
Check your plants regularly for spider mites, which love the dry air of heated homes. A quick misting with water or a application of neem oil can keep these pests under control.
Waking Your Geraniums Up in the Spring
As the days grow longer in late February or March, it is time to bring your dormant plants back to life. For bare-root plants, this involves a thorough soaking and repotting.
Trim the stems back to about 4 inches long. This might feel aggressive, but it stimulates new, green growth from the base of the plant, preventing it from becoming top-heavy.
Pot them in fresh soil and move them to a sunny window. Within a few weeks, you should see tiny green buds emerging from the seemingly dead stems.
The Hardening Off Process
You cannot move your plants directly from a cozy living room to the garden. They need to be “hardened off,” which is the process of gradually acclimating them to the outdoor environment.
Start by placing them outside in a shaded, protected spot for an hour or two during the day. Slowly increase their exposure to direct sunlight and wind over the course of 7 to 10 days.
Only plant them in the ground once the danger of frost has completely passed. Your “old” geraniums will quickly overtake any new nursery plants in size and flower production!
Frequently Asked Questions About how to overwinter geraniums
Can I leave my geraniums in the ground if I mulch them?
In most climates that experience freezing temperatures, mulching is not enough to save geraniums. They are tropical in nature and cannot survive a hard freeze where the ground temperature drops significantly.
How often should I check my bare-root geraniums?
I recommend checking them once a month. Look for any signs of rot or extreme dehydration. If the stems are shriveling too much, a quick misting or a brief root soak can save them.
What is the best temperature for how to overwinter geraniums?
The ideal temperature for dormant storage is between 45°F and 50°F (7°C – 10°C). If it gets too warm, the plant will try to grow without enough light; if it gets too cold, the plant will freeze and die.
Do I need to fertilize my geraniums during the winter?
No, you should stop fertilizing in the fall and wait until you see active new growth in the spring. Feeding a dormant plant can stress it and lead to weak, spindly growth that is prone to pests.
Final Thoughts on Winter Geranium Care
Learning how to overwinter geraniums is truly one of the most satisfying “hacks” in the gardening world. It transforms a seasonal flower into a long-term companion for your garden beds.
Whether you choose to keep them as indoor greenery or tuck them away in a dark basement, the effort you put in now will pay off ten-fold when the warm weather returns.
Don’t be discouraged if you lose a plant or two during your first attempt; gardening is all about experimentation and learning. Each year you do this, you will get better at reading the plants’ needs.
So, grab your pruners and some paper bags, and get to work! Your future spring garden will thank you for the extra care you provide today. Happy gardening!
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