Gardeners have traditionally favored geraniums. They smell wonderful, are colorful, and are simple to grow. How to cultivate geraniums in your house and garden is provided here!
(Note: This page is about Pelargonium plants, sometimes known as geraniums or storksbills. This is not a page about “hardy geraniums, also referred to as cranesbills.
Geraniums are normally kept indoors to overwinter, even if they may be kept outside throughout the warmer months of the year. In contrast, if given enough light, they can bloom all year long indoors.
Geranium or Pelargonium? A Case of Mistaken Identity
Early in the 18th century, Dutch traders who were traveling through South Africa brought the plants that we now refer to as “geraniums” to Europe. Botanists misclassified these new plants into the same genus because they resembled the hardy wild geraniums that are already present throughout Europe.
Botanist Carl Linnaeus of Sweden included them in the genus Geranium in 1753. Pelargonium, which refers to the long, sharply pointed shape of their seedpod, was used to reclassify these new “geraniums when it was later revealed that they differed from European geraniums in the shape of their petals, the number of stamens, and other features.
However, people still refer to them by their old common name, “geranium,” even if we really mean “pelargonium.”
- You can grow geraniums as annual blooms or as indoor plants. They can be kept outside in a sunny area throughout the warmer months of the year (between your local frost dates).
- If keeping geraniums as indoor plants, make sure to do so in the late summer or early fall when overnight lows begin to consistently fall below 55F. (13C).
- Pay great attention to the size and color of geraniums when purchasing them. Healthy stems and leaves will not be straggly or discolored on top of them or underneath them. A plant with evident insect indications should also be avoided. Mealybugs, whiteflies, and spider mites are typical indoor plant pests.
- To prevent root rot, put plants in containers with drainage holes.
- When planting in pots, use a well-draining potting mixture rather than heavy, clayey soil. Geraniums dislike being planted in mucky, compacted soil.
- Place the plants where they will receive 4-6 hours of sunlight per day for the best bloom.
How to Care for Geraniums
- After letting the soil somewhat dry between waterings, water it again well.
- Water plants significantly less throughout the winter, but make sure the roots are not completely dried up. Given a time of hibernation throughout the winter, when they consume less water and don’t grow as much, geraniums thrive. For additional overwintering tips, see the section below.
- Regularly deadhead spent flowers to promote blooming.
- Pinch back the stems to encourage bushiness and prevent legginess.
- Fertilize approximately every two weeks throughout the active growing months. Half-strength a fertilizer that is water soluble When the plant should be dormant in the winter, avoid fertilizing.
- Repotting geraniums can be done in the spring to promote new growth or if they appear to need revitalization.
Overwintering Geraniums
- If they receive plenty of sunlight, geraniums that have spent the summer outdoors can be kept indoors. The sun may not be strong enough in northern regions in late winter to promote buds on some cultivars.
- Lift the plants before the first fall frost (you can find your local frost dates here), and use a sharp, clean knife to shapely prune the stems back to about 6 to 8 inches. In the low-sunlight environment they are about to enter, they shouldn’t have to maintain substantial amounts of leaves. A simple technique to increase the number of your plants is to save a few stems for rooting.
- Place the “mother plant” in the smallest pot you can find—just big enough to hold the roots—and fill it with ordinary potting soil.
- The plants should be kept in the shadow for a week before being moved to a sunny location and kept cool.
- Geraniums thrive in temperatures between 50 and 60 degrees Fahrenheit (10 and 16 degrees Celsius) at night during the winter, but they can also withstand lows of 32 degrees Fahrenheit (0 degrees Celsius) and highs of 80 degrees Fahrenheit (27 degrees Celsius), provided they are kept relatively dry.
- Cut off all the old leaves when the spring growth begins.
Keeping the new growth alive is the only challenge that can compare to getting it to appear. Here is some assistance with that:
- Only offer tiny quantities of water when the leaves begin to droop. Don’t feed or fertilize the plants. These plants must have some downtime.
- Pinch back your overwintered geraniums in February if you want them to bloom by Memorial Day. Take the plants outside and move them to beds or pots, as you like, once warm weather returns and all threat of frost has passed.
- Containers are ideal for growing the Common or Zonal Geraniums (Pelargonium x hortorum) (as well as outdoors).
- Hanging baskets, window boxes, and containers are all extremely popular places to use Ivy-Leaf Geraniums (Pelargonium peltatum).
How to Root Stem Cuttings
The majority of geraniums readily take root from stem cuttings when placed in soil, sand, water, perlite, or another rooting medium.
- Make a slanted incision 4 inches below the tip of the stem, above the node where the leaves emerge, with a clean, sharp knife. Cut the grass immediately below a node. Remove all except two or three leaves, any buds, and the stipules that resemble leaves at the base of leaf stalks.
- To ensure that the cut end of the stem will seal and not rot, roll the stem cutting in newspaper or place it in the shade for 24 hours.
- Place the stem in a wet rooting media container and keep it there for two days in a warm, shaded area. Give the cutting indirect sun after that. Just as needed, moisten the medium.
- Apply crushed geranium leaves to small cuts to halt the bleeding.
- Scarlet geranium is the flower that speaks of foolishness. More floral meanings can be found here.
- You won’t have to worry about those bothersome bugs because geraniums are known to be harmful to Japanese beetles.
- Keep geraniums out of the reach of curious youngsters and animals (cats, dogs) as they might cause indigestion or vomiting.
Low light, overexposure, and underwatering are common issues. Yellowing leaves are a sign that you are watering your plants either too little or too much. Try to water the geraniums evenly in this situation, and transfer them to a more sunny location.
Geraniums are hardy to 40 degrees, right?
Any of the more than 250 different species of succulent, evergreen shrubby plants endemic to southern Africa are referred to as geraniums (Pelargonium spp.). Only 20 species, according to the “A-Z Encyclopedia of Garden Plants,” are frequently utilized to produce the numerous variations grown in gardens. To survive, they require lots of sunlight, low humidity, and well-draining soil; prolonged subfreezing temperatures completely destroy plants. Only U.S. Department of Agriculture hardiness zones 9 and warmer allow them to survive outside year-round.
What kind of temperature can a geranium withstand the least?
Grow geraniums as indoor houseplants or annuals outside their hardiness area. Geraniums can endure cooler temperatures and even light frosts, but when temperatures dip below 20 degrees Fahrenheit, they are subject to harsh lethal freezes, which can cause freeze damage and even lead to plant death. The minimum temperature for geraniums in Celsius is -7 degrees.
At what temperature should geraniums be brought indoors?
Geraniums do best in climates between 65 and 70 degrees Fahrenheit during the day and 55 degrees Fahrenheit at night. Horticulturists at the University of California claim that scented geraniums only require four hours of sunlight each day. Install a fluorescent light a few inches above the plants if you are unable to provide them with this. When you bring your potted plants inside after it gets below 45 degrees Fahrenheit, the sudden warmth may shock them, turning their leaves yellow and making them fall. Bring the plant indoors for a while before it becomes cold outside, ideally at night, to prevent this. Each day, gradually lengthen the time. This will ease the plant’s transition and minimize major stress. Give the plant more care and ensure that it receives the right amount of water, light exposure, and trimming until it recovers if it still exhibits indications of shock.
Are geraniums cold-sensitive?
According to the University of Florida, one of my favorite container plants, geraniums, cannot withstand a cold. However, if they have had some time to acclimate to the chilly weather, they may endure a light frost.
When can you plant geraniums outside?
You should wait to put your geraniums in the garden until the earth has warmed up and all threat of frost has passed. I plant my tropicals at the end of May or the beginning of June in my zone 6 NJ garden.
They prefer well-drained, somewhat acidic soil. After planting them, give them a vigorous watering, and for the remainder of the growing season, water them frequently, letting the soil dry out between applications.
For the best appearance, they require at least 4 hours of direct sunlight, ideally in the morning. They require shade in the middle of the day in regions with extremely hot summers. They will stop blooming if there is too much heat or not enough sunlight. In the summer, mulching the area surrounding your plants will keep the soil cool.
Fertilizing geraniums should be done every 4 to 6 weeks. Your plants will become bushier if you pinch them. The growing tip of the plant is removed by pinching it with two fingers. The plant will regenerate two or more new growing tips, making it bushier, once the growing tip has been removed. To promote reblooming, make sure to remove any dead flowers.
If you want to grow plants in containers, make sure the container you buy is big enough to fit the roots of the mature plant, which can grow up to 2′ tall. Typically, dwarf geraniums grow from 6 to 8. There must be a drainage hole in the container. Water frequently, letting the soil dry between applications, and fertilize every two to four weeks with either a delayed release fertilizer or a liquid fertilizer. You should place your container somewhere that receives morning sun and afternoon shade. Remove any dead flowers to promote reblooming and pinch the foliage to promote branching.
How do I keep my geraniums from freezing?
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If you have non-hardy plants in your garden, learning how to protect them against frost is crucial. While many perennials can withstand frost, sensitive plants, such as most summer-fruiting vegetables and annual flowers, cannot survive in cold temperatures.
Although you presumably took the necessary precautions to protect your plants from frost during the winter, even a seasoned gardener might be caught off guard by a late-winter or spring frost. Fortunately, you have a few options to keep your flowerbeds and vegetables alive.
There’s no reason to abandon your garden-related plans just because it snows occasionally in April. Your plants will survive it just fine if you follow our expert advice.
Geraniums can they survive a frost?
- Make sure you thoroughly inspect your geranium plants before bringing them inside for the winter. Look for symptoms of pests and illnesses like rust and remove any dead leaves or wilting blossoms. Only zonal pelargoniums are impacted by this, but it is becoming more widespread. It arrived in the nation for the first time in 1968, and it does best in the moist summer or fall months. Fortunately, it doesn’t seem to spread to the plants quickly and is simple to treat, so merely plucking the afflicted leaves is an effective management. You might also consider using the fungicide Dithane 945 as a spray.
- Placing your overwintering plants somewhere bright and sunny will help them retain their need for light throughout the winter. Your plants will receive 50% less light if they are placed more than three feet from a window!
- Because your plants continue to thrive throughout the winter, keep the roots moist. While geraniums frequently survive droughts, they rarely flourish. Show plant growers take special care to keep the roots of their plants damp but never soggy during the winter.
- Ventilate as frequently as you can to maintain a dry environment surrounding your plants. Your plants will turn into a moldy, rotting heap if you don’t allow the air to circulate. The greatest electric fan heaters are those that operate automatically since they circulate air while simultaneously raising air temperature.
- Geraniums are fairly inexpensive to overwinter in the greenhouse because they only need to be kept frost-free. To keep temperatures above freezing, however, we do advise utilizing a heater. Set the thermostat on your heater to 5C, which is 41F. The plant will not survive if the stems become frosty! The winter months are a great time to store your delicate pelargoniums in porches, sunrooms, or conservatories.
We hope that we have provided you with enough of tips so that you can continue to enjoy your geraniums year after year. Visit our geraniums hub page, which is brimming with useful resources, for additional details on how to cultivate and take care of these well-liked plants. And do get in touch with us through our social media outlets to share your personal favorites; we’d love to hear from you.
Can geraniums survive the cold outdoors?
If given the proper care, geraniums can survive the winter. Geraniums are notoriously difficult for gardeners to overwinter.
Can a geranium be kept indoors?
Pelargonium species, which come in pots, make great indoor plants that may be grown all year round. They normally become available in March through June, and if given enough light inside the house, they will bloom continuously. There are several fresh varieties, like vining and hanging basket cultivars. They are available in many different types of containers and at varying stages of development.
What temperature is too low for hanging baskets?
The following temperatures will harm plants in hanging baskets, according to Wikipedia: Frosty conditions: 0 to 3.5 C (32.0 to 25.7 F) 3.6 to 6.5 C for mild frost (25.6 to 20.3 F) Frosty conditions: 6.6 to 11.5 C (20.2 to 11.3 F)
How cold should it be for plants to be outside?
Eek!! The forecast calls for evening lows at or below freezing with frost! What shall I do?
The good news is that there are a few simple things you can do to help protect your plants against cold conditions. Remember that a frost is different from a freeze. Additionally, following a frost in the fall, some crops, such as beets, parsnips, and carrots, only get sweeter to taste.
Know Your Frost Dates
Priorities first! Always keep in mind the first and latest frost dates that often occur in your area.
The first day of the year that a frost occurs is regarded as the first frost date as the fall weather begins to cool. The first freeze date of the year will come as the weather cools further, typically a week or two later (this is what kills most annual plants). The first freeze day and first frost date in Missoula are both in the middle of October.
The average last frost date is the first day of the year we may anticipate a frost when the weather starts to warm up in the spring. The last frost date in Missoula is May 18.
These dates are typically correct but by no means exact because they are based on historical meteorological data that was gathered over a 30 year span. Be diligent, keep an eye on the forecast, or set up a weather app alert to be notified when the nightly lows change. Use the four techniques listed below to temporarily safeguard your plants when temperatures are predicted to drop to near or below freezing.
Assess: How Bad Is It?
Plants are harmed by temperatures at or below freezing for longer periods of time than just a single day. Similar to how lower temperatures are tougher on plants than those at or near freezing, really cold temperatures that linger for several hours are significantly harder on plants than those that are at or near freezing for only an hour or less. Keep this in mind along with several key definitions listed below when evaluating the severity of the weather report.
When the temperature is forecast to drop to between 36 and 32 degrees Fahrenheit, a frost advisory is issued.
When there is at least an 80% likelihood that the temperature will drop to 32 degrees Fahrenheit or lower, a freeze warning is issued.
The majority of plants are severely harmed by a severe or harsh freeze, 25 degrees Fahrenheit or lower.