Table of Contents
- Introduction
- Understanding the Different Begonia Families
- Choosing the Best Location: Light and Temperature
- How to Plant Begonias: Soil and Drainage
- Mastering the Art of Watering
- Humidity and Airflow
- Feeding and Grooming for Continuous Color
- Overwintering: Caring for Your Plants in the Off-Season
- Simple Ways to Multiply Your Plants
- Conclusion
- FAQ
Introduction
There is a unique kind of magic in the way a begonia’s leaves catch the morning light. Whether you are mesmerized by the shimmering, metallic patterns of a Rex begonia or the massive, rose-like blooms of a tuberous variety, these plants bring a tropical elegance to any setting. They are the versatile champions of the shade, turning quiet corners of the porch or dimly lit rooms into vibrant displays of color.
Helping home gardeners discover the joy of these easy-to-grow favorites is one of our favorite things to do at Longfield Gardens, and our Begonia collection is a great place to start. We have found that while there are thousands of varieties, caring for them successfully comes down to a few simple principles that anyone can master. This guide is designed to help you understand what your specific plant needs to flourish, whether it is growing in a garden bed, a hanging basket, or on your favorite windowsill.
In the following sections, we will walk through identifying your begonia type, mastering its light and water requirements, and keeping it healthy year-round. Learning how to care for a begonia plant is a rewarding journey that adds lasting beauty to your home and garden.
Understanding the Different Begonia Families
The first step in caring for your plant is knowing which branch of the begonia family it belongs to. While they all share a love for humidity and well-draining soil, their growth habits and seasonal needs can vary. Identifying your type ensures you are giving it the specific care it needs to look its best.
Tuberous Begonias
These are often the stars of the summer shade garden. Tuberous begonias grow from a thick, potato-like underground stem called a tuber. They are famous for their large, spectacular flowers that can be upright or trailing. Varieties like the Non Stop Begonias series or "Illumination" trailing begonias are perfect for hanging baskets and window boxes. Because they grow from tubers, these plants have a distinct dormancy period and need to be stored over the winter in most climates.
Wax Begonias (Fibrous)
Wax begonias are the reliable workhorses of the landscape. They have succulent, waxy leaves that are either bright green or deep bronze. Their flowers are smaller but incredibly prolific, covering the plant in shades of red, pink, or white from spring until the first frost. They have a fibrous root system and are often treated as annuals in cooler zones, though they can be brought indoors as houseplants.
Rex Begonias
If you love foliage, Rex begonias are for you. These are primarily grown for their leaves, which feature swirls of silver, purple, burgundy, and green. They are most commonly grown as houseplants but enjoy spending summer in a shady spot outdoors. Rex begonias grow from a creeping rhizome—a thick stem that grows horizontally along the soil surface.
Cane and Angel Wing Begonias
Cane begonias are named for their long, upright stems that resemble bamboo. The Angel Wing variety is the most famous, known for its wing-shaped leaves often decorated with silver spots. These are exceptionally easy to care for indoors and can grow several feet tall, making them a wonderful statement plant for a living room or office.
Key Takeaway: Determining if your begonia grows from a tuber, a rhizome, or a fibrous root system is the quickest way to understand its watering and winter needs.
Choosing the Best Location: Light and Temperature
Begonias are often called "shade plants," but that term can be a bit misleading. While they certainly do not want to be scorched by the mid-day sun, they still need plenty of light to produce those famous blooms and rich leaf colors.
Finding the Right Light
For outdoor begonias, "dappled shade" is the golden rule, and our guide to Are Begonias Shade or Sun Plants? breaks down the differences. This means the plant receives filtered sunlight through the leaves of a tree or is protected by a porch roof. In northern climates, begonias can often handle more morning sun, but in the South, the hot afternoon sun can cause the leaves to "scald" or turn brown and crispy at the edges.
Indoor begonias, especially Rex and Cane varieties, prefer bright, indirect light. A spot near an east-facing window is often ideal. If you notice your plant looks "leggy" (long stems with very few leaves), it is likely reaching for more light. Conversely, if the leaves look bleached or washed out, it may be getting too much direct sun.
Temperature Preferences
Begonias are tropical at heart. They are most comfortable in temperatures between 60°F and 75°F. Outdoors, they should not be planted until the nights are consistently above 50°F. If a surprise late-spring frost is predicted, it is best to cover your outdoor containers or bring them inside temporarily. Check your hardiness zone before moving plants outdoors for the season.
What to do next:
- Observe your garden or room for a few days to identify areas with "bright, indirect" light.
- Check your local weather forecast before moving plants outdoors for the season.
- If you use a porch, place begonias on the side that receives morning sun rather than scorching afternoon heat.
How to Plant Begonias: Soil and Drainage
Success with begonias begins beneath the surface. These plants have relatively delicate root systems that need a balance of moisture and air. The most common hurdle for new begonia growers is soil that stays too wet for too long.
Selecting the Right Soil
Whether you are planting in the ground or a container, use a high-quality potting mix that is "well-draining." This means the soil allows water to pass through quickly rather than holding it like a sponge. For container planting, a peat-moss-based mix with added perlite or vermiculite is perfect. Perlite is the white, popcorn-like material that helps create tiny air pockets in the soil, which prevents the roots from suffocating.
The Importance of Drainage
Begonias should never sit in standing water. If you are using decorative pots, ensure they have drainage holes at the bottom. If you find a beautiful pot without a hole, it is best to keep the begonia in a slightly smaller plastic "nursery pot" and place that inside the decorative one. This is called "double potting." When you water, you can lift the inner pot out, let it drain in the sink, and then put it back.
Planting Depth and Spacing
For tuberous begonias, planting depth is very important, and Upright Double Begonias are a great place to see those forms. Place the tuber with the hollow (concave) side facing up. Cover it with only about an inch of soil. If you plant them too deep, the stems might struggle to reach the light. Space your plants 6 to 12 inches apart to ensure they have enough room for air to circulate between the leaves, which helps prevent mildew.
Mastering the Art of Watering
If there is one "secret" to begonia care, it is getting the water right. Begonias are succulent-like, meaning they store water in their thick stems and leaves. Because of this, they are much more tolerant of being a little dry than being constantly soaked.
The "Finger Test"
Instead of watering on a strict schedule (like every Monday), use your finger to check the soil moisture. Stick your finger about an inch or two into the soil. If it feels dry, it is time to water. If it still feels cool and damp, wait another day or two. For more tuberous begonia basics, see Tips for Growing Tuberous Begonias.
How to Water
When it is time to water, apply it directly to the soil rather than over the top of the leaves. Wet leaves can lead to fungal issues like powdery mildew. Water thoroughly until it runs out of the bottom of the pot, then empty any water that collects in the saucer. Leaving a begonia in a saucer full of water is a fast way to cause root rot.
Adjusting for the Seasons
Plants need more water when they are actively growing in the heat of summer and much less during the winter. Our trial gardens at Longfield Gardens show that begonias in containers dry out much faster than those in the ground. On a hot, breezy July day, a hanging basket might need water daily, while an indoor Rex begonia might only need it once every week or two in the winter.
Key Takeaway: "Deep, then dry" is the best rule for begonias. Water deeply until it drains, then allow the top inch of soil to dry before watering again.
Humidity and Airflow
Because begonias are native to tropical regions, they appreciate a bit of humidity in the air. However, there is a big difference between humid air and stagnant air.
Increasing Humidity Safely
Indoor air in the winter can be very dry, which often leads to brown, crispy leaf edges on Rex and Cane begonias. To help your plants, you can use a "pebble tray." Fill a shallow tray with small stones and add water until it is just below the tops of the stones. Place your pot on the stones. As the water evaporates, it creates a humid microclimate around the plant without making the soil soggy.
Avoid the common "internet hack" of misting the leaves with a spray bottle. Misting only increases humidity for a few minutes and leaves the foliage wet, which encourages disease.
The Value of Airflow
Good air circulation is a begonia's best friend. It helps the soil surface dry out and prevents fungal spores from settling on the leaves. If you are growing begonias outdoors, don't crowd them too closely against a wall or other plants. Indoors, a small fan nearby (but not blowing directly on the plant) can help keep the air moving.
Feeding and Grooming for Continuous Color
To keep your begonias looking like they just came from the greenhouse, a little regular maintenance goes a long way. This involves feeding the plants during their growing season and "grooming" them to encourage more flowers and leaves.
Fertilizing Basics
Begonias are moderate feeders. During the spring and summer, when the plant is pushing out new growth, use a balanced, water-soluble fertilizer. You can apply it at half-strength every two to four weeks. If you are growing begonias primarily for their flowers (like Tuberous or Wax varieties), look for a fertilizer with a slightly higher middle number (phosphorus) to promote blooming. If you are growing Rex begonias for foliage, a balanced "all-purpose" mix is best. Stop fertilizing in late autumn as the plant’s growth slows down for the winter.
Pinching and Deadheading
"Pinching" sounds scary, but it is actually a great way to help your plant. If a Cane or Rex begonia is getting too tall and spindly, simply pinch off the very tip of a stem. This signals the plant to grow two new stems from the leaf joints below, resulting in a fuller, bushier plant. For more pruning help, see How to Trim a Begonia Plant for Fuller, Healthier Growth.
"Deadheading" is the process of removing faded flowers. Most modern wax begonias are "self-cleaning," meaning the old flowers fall off on their own. However, with tuberous begonias, removing the spent blooms and any yellowing leaves will keep the plant looking tidy and help prevent mold or rot from starting on the decaying tissue.
What to do next:
- Add "fertilize begonias" to your calendar for every other week during summer.
- Check plants once a week for any yellowing leaves or spent blooms.
- Pinch back leggy stems in early summer to encourage a lush shape.
Overwintering: Caring for Your Plants in the Off-Season
Since begonias are tender perennials, they cannot survive a freeze. How you care for them in the winter depends on which type you have. This transition is a natural part of the plant’s life cycle.
Storing Tuberous Begonias
When the leaves start to yellow in the autumn, stop watering the plant. After the first light frost kills the top growth, lift the tubers out of the soil. Cut the stems back to about an inch above the tuber. Let the tubers dry in a cool, indoor spot for a few days until the remaining stem piece falls off easily. Store the clean tubers in a box of peat moss or sawdust in a cool, dark, frost-free place (around 40°F to 50°F) until spring. For a complete seasonal walkthrough, see How to Overwinter Begonia Plants.
Bringing Wax and Rex Begonias Indoors
Wax, Rex, and Cane begonias can be brought inside to live as houseplants during the winter. It is best to bring them in before the outdoor temperatures drop below 50°F so they don't experience "temperature shock." Check them thoroughly for any hitchhiking garden pests before placing them near your other houseplants. During the winter, they will grow much more slowly, so remember to reduce your watering and stop fertilizing until spring returns.
A Note on Safety
It is important to note that begonias contain calcium oxalates, which can be toxic if eaten by pets or children. They can cause mouth irritation and digestive upset. It is always a good idea to keep your begonias on high shelves or in areas where curious pets and toddlers cannot reach them.
Simple Ways to Multiply Your Plants
One of the most rewarding aspects of begonia care is how easy they are to propagate. Once you have one healthy plant, you can create "backups" or new plants to share with friends.
Stem Cuttings
Cane and Wax begonias are easily grown from stem cuttings. Simply cut a 4-inch piece of stem that has at least two "nodes" (the little bumps where leaves grow). Remove the bottom leaves and place the stem in a glass of water or a small pot of moist potting mix. Within a few weeks, you will see new roots forming.
Leaf Cuttings
Rex begonias can be propagated using just a single leaf! You can cut a healthy leaf into wedges, making sure each wedge has a piece of a main vein. Press these wedges into moist soil, keep them in a humid spot, and tiny new plantlets will eventually sprout from the base of the vein. This process requires a little patience, but seeing those tiny new leaves appear is a true gardening win.
Rhizome Division
For large Rex or rhizomatous begonias, you can simply divide the plant when you repot it in the spring. Carefully pull the rhizomes apart, ensuring each piece has a few roots and at least one growing point (an "eye"). Plant these pieces in their own pots, and they will quickly grow into full-sized plants.
Conclusion
Caring for begonias is an accessible way to bring high-impact color and texture into your life. By matching your plant to the right light, using well-draining soil, and following the "deep, then dry" watering method, you can enjoy these tropical beauties for many years. Whether you are planting a shade border or decorating your desk, begonias are remarkably rewarding plants that respond well to simple, consistent care.
- Identify your begonia type to tailor your care routine.
- Provide bright, indirect light and protect from harsh afternoon sun.
- Let the top inch of soil dry out before watering again.
- Maintain humidity with a pebble tray for indoor foliage varieties.
- Store tuberous varieties in a cool, dry place over the winter.
We are here to help you grow your best garden ever. We invite you to explore the wide variety of flower bulbs and perennials with us at Longfield Gardens and start your begonia journey today!
FAQ
Why are the leaves on my begonia turning brown and crispy at the edges?
This is usually caused by low humidity or the soil being allowed to dry out too much. For indoor begonias, try using a pebble tray to increase the moisture in the air around the plant. If the plant is outdoors, it may be getting too much direct afternoon sun, and moving it to a shadier spot should help.
How often should I fertilize my begonia plant?
During the active growing season (spring through summer), you should feed your begonias every two to four weeks with a balanced, water-soluble fertilizer. Be sure to dilute the fertilizer to half-strength to avoid burning the delicate roots. Stop fertilizing during the winter months when the plant is resting.
Can I grow begonias in full sun?
Most begonias prefer partial shade, but some wax begonias with bronze-colored foliage can handle more sun than the green-leaved varieties. In cooler northern climates, begonias can often tolerate more direct light than they can in the hot, humid South. If you notice the leaves looking pale or scorched, move the plant to a spot with more protection from the sun.
What should I do if my begonia looks long and "leggy"?
A leggy plant is usually a sign that it isn't getting enough light. Move your begonia to a brighter location with indirect sunlight. You can also "pinch back" the long stems by snipping off the tips, which will encourage the plant to grow bushier and produce more leaves lower down on the stems.