Table of Contents
- Introduction
- Understanding the Different Types of Begonias
- Choosing the Right Spot: Sun, Soil, and Drainage
- How to Plant Tuberous Begonias
- Watering Correctly, Not Constantly
- Feeding for Continuous Blooms
- Maintaining Your Begonias through the Season
- Overwintering Tuberous Begonias
- Growing Begonias as Houseplants
- Troubleshooting Common Success Tips
- Conclusion
- FAQ
Introduction
Finding the perfect splash of color for a shady corner is one of the most rewarding moments for any gardener. While many plants prefer the heat of the full sun, begonia bulbs are the stars of the shade, offering lush foliage and brilliant blooms that last from early summer right through the first frost. Whether you are looking to fill a hanging basket on a covered porch or add texture to a woodland border, these versatile plants provide a tropical feel with very little fuss.
At Longfield Gardens, we believe that every yard has the potential to be a masterpiece, and begonias are a key tool for achieving that goal. These plants are beloved for their diversity, ranging from the delicate wax varieties found in many garden beds to the massive, ruffled blooms of tuberous types like Begonia Upright Double Roseform Pink & Picotee White. They are accessible to beginners and seasoned pros alike because they reward simple, consistent care with a spectacular show of color.
In this guide, we will walk through the essentials of how to grow begonia plants successfully in your own landscape. We will cover selecting the right location, mastering the planting process, and providing the seasonal care needed to keep your plants thriving. By focusing on a few foundational steps, you can enjoy a garden filled with these elegant, easy-to-manage flowers all season long. For more on shade-loving combinations, see Summer Bulbs for Shady Gardens.
Understanding the Different Types of Begonias
Before you get your hands in the soil, it is helpful to know which type of begonia you are working with. While there are thousands of species and hybrids, most home gardeners will encounter four main categories. Each has a slightly different growth habit and preference, though they all share a love for filtered light and well-drained soil. For a broader overview, All About Begonias covers the basics.
Tuberous Begonias
These are the showstoppers of the begonia world. Grown from thickened underground stems called tubers, these plants produce large, dramatic flowers that often resemble roses or camellias. They come in two primary forms: upright varieties that look stunning in garden beds and trailing varieties like Begonia Hanging Golden Balcony that spill beautifully over the edges of containers and hanging baskets. Tuberous begonias are particularly valued for their intense colors, including vibrant oranges, deep reds, and soft pastels.
Wax Begonias (Fibrous-Rooted)
If you have ever seen a neat row of begonias in a public park or a formal garden border, they were likely wax begonias. These plants are identified by their waxy, succulent leaves and constant clusters of small flowers. They are extremely hardy and can handle a bit more sun than their cousins. They are typically treated as annuals in most parts of the United States, meaning they complete their life cycle in one growing season.
Rex Begonias (Rhizomatous)
Rex begonias are grown primarily for their incredible foliage rather than their flowers. Their leaves feature intricate patterns, swirls, and metallic sheens in shades of silver, purple, pink, and burgundy. Because they grow from rhizomes—thick stems that creep along the soil surface—they have a mounding habit that makes them excellent as houseplants or accent plants in shaded containers.
Cane Begonias
Commonly known as "Angel Wing" begonias because of the shape of their leaves, cane begonias have upright, woody stems that resemble bamboo. They can grow quite tall and often feature spotted or variegated foliage. These are popular as long-lived houseplants, but they also make a bold statement in large outdoor patio pots during the warm summer months.
Choosing the Right Spot: Sun, Soil, and Drainage
The secret to a healthy begonia starts with its environment. In the gardening world, we often say "right plant, right place," and for begonias, that means finding a spot that mimics their native tropical forest floor.
Finding the Best Light
Most begonias prefer partial shade or filtered sunlight. This means they like a spot where they are protected from the harsh, direct rays of the afternoon sun, which can scorch their tender leaves and cause colors to fade. A location that receives gentle morning sun followed by afternoon shade is often the "sweet spot," and Design Tips for Shady Gardens can help you plan around it. If you notice your plants are becoming "leggy"—meaning the stems are stretching out and looking thin—they might be asking for a little more light. Conversely, if the leaves look bleached or develop brown, brittle edges, they are likely getting too much sun.
Soil Quality and Drainage
Begonias need soil that is rich in organic matter and, most importantly, offers excellent drainage. Drainage refers to how quickly water moves through the soil. If water sits around the roots for too long, the plant can suffer from rot. To give your plants the best start, use a high-quality potting mix for containers or amend your garden soil with compost or peat moss. For more planting advice, see Tips for Growing Tuberous Begonias.
If you are planting in the ground and notice that puddles remain for several hours after a heavy rain, that spot may be too wet for begonias. You can improve the area by building a raised bed or adding organic material to loosen the soil structure. For containers, always ensure there are adequate holes in the bottom to let excess water escape.
Key Takeaway: Begonias thrive in "bright shade." Aim for a location with dappled light and soil that stays moist but never stays soggy or waterlogged.
How to Plant Tuberous Begonias
While wax begonias are often sold as established "starts" in cell packs, tuberous begonias are frequently started from dormant tubers in the spring. Planting them correctly is a simple process that sets the stage for a summer full of blooms.
Timing Your Planting
Because they are tropical plants, begonias are very sensitive to cold. Timing is more important than any special gardening "trick." You should wait to move your begonias outdoors until the danger of frost has completely passed and the overnight temperatures consistently stay above 60°F. In many regions, you can get a head start by planting the tubers indoors in pots about 8 to 12 weeks before the last expected frost. How to Start Tuberous Begonias Indoors offers a simple step-by-step approach.
Depth and Spacing
When you look at a begonia tuber, you will notice one side is slightly indented or hollowed out. This is the top. The "eyes" or sprouts will emerge from this concave side.
- Prepare the Soil: Fill your container or garden spot with loose, moist soil.
- Position the Tuber: Place the tuber with the indented side facing up.
- Set the Depth: Tuberous begonias should be planted shallowly. Cover them with only about 1/2 inch of soil. If they are buried too deep, they may struggle to sprout or become prone to rot.
- Give Them Space: Space your begonias about 8 to 12 inches apart to allow for good air circulation, which helps prevent leaf diseases.
Initial Watering
After planting, give the soil a light watering to help it settle around the tuber. At this early stage, the plant doesn't have a root system yet, so it doesn't need a lot of water. Keep the soil just barely moist until you see the first green sprouts poking through.
Watering Correctly, Not Constantly
Watering is the area where most gardeners either succeed or struggle with begonias. The goal is to provide "deep" moisture while allowing the soil to dry out slightly between sessions.
The Finger Test
Instead of watering on a strict schedule, use the "finger test." Stick your finger into the soil about an inch deep. If the soil feels dry, it is time to water. If it still feels damp, wait another day or two. Begonias store water in their thick, succulent stems, so they are actually quite resilient if they miss a single watering. However, they will react poorly if they sit in a pool of water for days on end.
Where to Water
When you water, try to direct the stream at the base of the plant rather than splashing the leaves. Keeping the foliage dry helps prevent common issues like powdery mildew, a fungal growth that looks like a dusting of white flour on the leaves. Early morning is the best time to water, as it allows any accidental moisture on the leaves to evaporate quickly in the daylight.
Adjusting for Environment
Plants in containers, especially hanging baskets, dry out much faster than those in the ground. Best Summer Bulbs for Containers is a helpful place to look for more pot-friendly ideas. During the peak of summer heat, you may need to check your container begonias every day. If you live in a very humid climate, your plants may need less frequent watering than those in a dry, breezy area.
Feeding for Continuous Blooms
Begonias are energetic growers that produce a lot of flowers over many months. To keep that energy up, they benefit from regular feeding. A big-blooming option like Begonia Upright Double Superba Mix - Bulk Offer is a good example of the types that respond well to consistent care.
Choosing a Fertilizer
A balanced, water-soluble fertilizer is usually the easiest choice for home gardeners. Look for a product where the three numbers on the label (nitrogen, phosphorus, and potassium) are relatively equal, or one formulated specifically for flowering plants.
Frequency
For most begonias, a half-strength application of liquid fertilizer every two weeks is plenty. If you are growing tuberous begonias specifically for their giant blooms, they may appreciate a slightly more frequent feeding schedule during their peak blooming months of July and August. Always follow the instructions on the product label, as over-fertilizing can lead to excessive leaf growth at the expense of flowers.
One Change at a Time
If your plant looks unhappy, resist the urge to add more water, more fertilizer, and more sun all at once. Change one variable—like moving it to a slightly shadier spot—and wait a week to see how the plant responds. This simple approach makes troubleshooting much easier.
Maintaining Your Begonias through the Season
With the right start, begonias are relatively low-maintenance, but a little bit of "grooming" will keep them looking their best until autumn. A cascading type like Begonia Upright Double Bertini also benefits from staying neat and well spaced.
Deadheading
Deadheading is the process of removing faded or spent flowers. This isn't just about keeping the plant looking tidy; it also encourages the plant to put its energy into creating new blooms rather than producing seeds. For many begonias, the old flowers will drop off on their own, but a quick "pinch" of any wilting stems will help the plant stay vibrant.
Managing Growth
If your cane or wax begonias start to look a little "leggy" or lopsided, do not be afraid to prune them. Use a clean pair of scissors to snip the stems back just above a leaf node (the spot where a leaf joins the stem). This encourages the plant to branch out, resulting in a fuller, bushier appearance.
Air Circulation
Begonias love humidity, but they also need fresh air. If plants are crowded too closely together, moisture can get trapped between the leaves, leading to fungal issues. If you notice your plants are overlapping significantly, you can trim back a few leaves or move containers further apart to improve the airflow.
What to do next:
- Check the soil moisture daily during heatwaves.
- Pinch off faded blooms once a week to encourage new growth.
- Apply a balanced fertilizer every two weeks at half strength.
- Rotate containers occasionally so all sides of the plant receive equal light.
Overwintering Tuberous Begonias
One of the best things about tuberous begonias is that you can save them from year to year, and Winter Storage for Tender Bulbs and Tubers explains how to keep the tubers alive until spring. While the foliage will die back when the weather turns cold, the tuber remains alive and can be stored indoors for the winter.
Preparing for Dormancy
As the days get shorter in late summer and early fall, you will notice your begonias naturally begin to slow down. If you are not sure what your climate can handle, the Hardiness Zone Map is a helpful reference. The leaves may start to yellow, and the plant will produce fewer flowers. This is your signal to stop fertilizing and begin reducing the amount of water you provide.
Digging and Storing
Before the first hard frost hits, it is time to bring the tubers inside.
- Lift the Tubers: Gently dig up the tubers or remove them from their pots.
- Clean Them Up: Cut the stems back to about an inch or two above the tuber. Brush off any loose soil, but do not wash them with water, as excess moisture can cause rot during storage.
- Cure Them: Place the tubers in a dry, cool spot for a few days to let the outer skin "cure" or toughen up.
- Store for Winter: Place the cured tubers in a cardboard box or paper bag filled with peat moss, sawdust, or vermiculite. Store them in a cool (40-50°F), dry, and dark place like a basement or a cool closet.
In the spring, you can pull them out, check for firmness, and start the cycle all over again!
Growing Begonias as Houseplants
If you don't have a garden space, or if you want to bring the beauty of begonias inside, many varieties make excellent houseplants. Rex begonias and cane begonias are the most popular choices for indoor life.
Indoor Lighting
Indoors, the rules for light are slightly different. Because window glass filters some of the sun's intensity, a begonia inside can handle more direct light than it could outside. An east or west-facing window is usually ideal. If you only have a very sunny south-facing window, place the plant a few feet back from the glass or use a sheer curtain to soften the light.
Managing Indoor Humidity
Modern homes can have very dry air, especially in the winter when the heat is running. Since begonias are tropical, they appreciate a bit of extra humidity. You can achieve this by grouping several plants together, which creates a small microclimate of moisture, or by placing the pot on a "pebble tray." This is simply a shallow tray filled with pebbles and a small amount of water; as the water evaporates, it humidifies the air immediately around the plant.
Potting and Repotting
Indoor begonias generally prefer to be a little bit "root-bound," meaning they like their roots to feel a bit snug in the pot. You don't need to rush into a larger container every year. If you see roots growing out of the drainage holes or the plant seems to dry out almost immediately after watering, it is time for a pot that is about one to two inches wider than the current one.
Troubleshooting Common Success Tips
Gardening is a journey of observation, and begonias are very good at telling you what they need if you know what to look for.
Yellowing Leaves
If the lower leaves of your begonia are turning yellow and feeling soft or mushy, it is almost always a sign of overwatering. Let the soil dry out completely before watering again. On the other hand, if the leaves are yellowing but feel dry and crispy at the edges, the plant might be thirsty or getting too much direct sun.
Dropping Buds
It can be disappointing to see flower buds fall off before they open. This is often caused by a sudden change in the environment—such as a dramatic swing in temperature or a period of extreme dryness followed by heavy watering. Keep your care as consistent as possible to help the plant stay stable.
Powdery Mildew
As mentioned earlier, this looks like white spots on the leaves. If you see this, the first step is to improve air circulation and ensure you are only watering the soil, not the leaves. You can also remove the most affected leaves to stop the spread. For persistent issues, consult your local garden center for a mild organic fungicide labeled for indoor or outdoor use.
Conclusion
Growing begonias is one of the simplest ways to transform a shady yard into a lush, colorful retreat. By matching the right variety to your space and focusing on the basics of drainage and light, you can enjoy a season filled with spectacular blooms and intricate foliage. Whether you are planting a single tuber like Begonia Upright Double Nonstop Apricot in a basket or a whole border of wax begonias, the reward is a garden that feels both tropical and timeless.
Our team at Longfield Gardens in Lakewood, New Jersey, is always excited to see how home gardeners use these versatile plants to enhance their landscapes. Remember that gardening is an enjoyable, evolving process. Each season offers a new opportunity to learn more about your soil, your local weather, and the unique needs of your plants.
- Select the right spot: Look for filtered light and avoid the harsh afternoon sun.
- Prioritize drainage: Use loose soil and containers with holes to prevent root rot.
- Be patient with watering: Use the finger test to ensure you aren't overwatering.
- Save your tubers: Dig up tuberous varieties in the fall to enjoy them again next year.
"The beauty of the begonia lies in its ability to bring light and life to the quietest, shadiest corners of the garden. With just a little consistent care, these plants offer a spectacular return on your investment."
We invite you to explore the many varieties we offer and start your own begonia tradition this spring. For more tips on planning your dream garden, you can find helpful advice on our Garden Basics Design page. Happy planting from all of us at Longfield Gardens!
FAQ
Can begonias grow in full sun?
Most begonias prefer partial shade, but certain varieties, like wax begonias with bronze-colored leaves, can tolerate more sun if they are kept consistently moist. However, in very hot climates, even sun-tolerant varieties will perform better with protection from the intense afternoon heat.
How do I know which side of a begonia tuber is the top?
Begonia tubers have a distinct "cup" or indented side and a rounded side. The indented, concave side is the top and should face upward when planting. This is where the new stems and leaves will sprout.
Why are the leaves on my begonia turning brown and crispy at the edges?
Crispy brown edges usually indicate that the plant is getting too much direct sunlight or the humidity is too low. Try moving the plant to a shadier location or using a pebble tray to increase the moisture in the air around the foliage.
Do I need to dig up my begonias every winter?
If you live in a cold climate (USDA zones 8 or lower), you must dig up tuberous begonias before the first frost if you want to keep them for the following year. Wax begonias are typically treated as annuals and replaced each spring, though they can be brought indoors as houseplants if you have a bright enough window.