How to Plant and Care for Begonias

Table of Contents

1. Introduction
2. Identifying Your Begonia Type
3. Choosing the Perfect Location
4. How to Plant Begonias
5. Essential Care for Healthy Growth
6. Humidity and Indoor Care
7. Overwintering Your Begonias
8. Simple Solutions for Common Issues
9. Creating Beautiful Displays
10. Conclusion
11. FAQ

Introduction

There is a special kind of magic in finding a plant that turns a shaded corner into a vibrant oasis of color. Whether you are looking for the massive, rose-like blooms of tuberous begonias or the swirling, iridescent patterns of Rex begonia foliage, these plants offer a level of beauty that few other shade-lovers can match. Watching a small tuber or a modest nursery start transform into a lush, flowering specimen is one of the most satisfying experiences a gardener can have.

At Longfield Gardens, we believe that everyone should enjoy the rewards of growing these versatile beauties. Browse our begonia collection to find the right fit for your space.

Begonias are surprisingly easy to manage once you understand their basic needs for warmth, light, and water. This guide is designed to help you navigate the different types of begonias and provide the practical steps you need to keep them thriving all season long. From choosing the right potting mix to overwintering your favorite varieties, we have gathered our best advice for gardeners of all skill levels.

By focusing on a few simple rules of care, you can ensure your begonias remain the highlight of your garden or home. Understanding the specific needs of your variety is the first step toward a successful growing season.

Identifying Your Begonia Type

Before you pick up a trowel, it is helpful to know exactly which type of begonia you are working with. Because the begonia family is so diverse, plants are often grouped by their root systems or growth habits. Each group has slightly different preferences for light and water.

Tuberous Begonias

These are the showstoppers of the begonia world. They grow from a thick, brown, potato-like structure called a tuber. Tuberous begonias are famous for their large, dramatic flowers that can be single or double, often resembling roses or camellias. You will find them in both upright and hanging varieties, making them the perfect choice for hanging baskets and window boxes. They typically go dormant in the winter and require a rest period.

Wax Begonias (Fibrous-Rooted)

If you have seen mass plantings of begonias in public parks or as edging in garden beds, they were likely wax begonias. These are tough, compact plants with succulent, waxy leaves that can be green or deep bronze. They produce clusters of small white, pink, or red flowers throughout the summer. Because they have a fibrous root system rather than a tuber, they are often treated as annuals in most climates, though they can be kept year-round in frost-free areas.

Rex and Rhizomatous Begonias

These varieties are grown primarily for their stunning foliage. A rhizome is a thick, fleshy stem that grows horizontally along or just below the soil surface. Rex begonias feature leaves with metallic sheens, intricate spirals, and bold colors like burgundy, silver, and lime green. While they do produce flowers, the primary "show" is the leaves. These are favorites for indoor collections but also excel in shaded outdoor containers.

Cane-Stemmed (Angel Wing) Begonias

Named for their upright, bamboo-like stems and wing-shaped leaves, angel wing begonias are elegant and architectural. Many varieties feature silver spots or "freckles" on their foliage. They produce heavy clusters of drooping flowers in shades of red, pink, orange, or white. They are excellent as houseplants or as tall focal points in a summer garden.

Key Takeaway: Identifying whether your begonia grows from a tuber, a rhizome, or a fibrous root system is the easiest way to determine its watering and light needs.

Choosing the Perfect Location

Success starts with the right environment. While begonias are famous for their ability to bloom in the shade, "shade" can mean many things in a garden. Matching the plant’s light and soil needs to your site is the most important decision you will make.

Light Requirements

Most begonias prefer bright, filtered light rather than deep, dark shade. In their native tropical habitats, they often grow under a canopy of trees where the light is dappled.

• Morning Sun: A spot that receives gentle morning sun followed by afternoon shade is often the "sweet spot" for most varieties.
• Afternoon Protection: Direct afternoon sun in the heat of the summer can scorch the leaves and cause flowers to wilt. If you notice the edges of the leaves turning brown and crisp, your plant might be getting too much direct light.
• Foliage Color Clue: Generally, begonias with darker or bronze foliage can handle more sun than those with bright green or variegated leaves.

Soil and Drainage

"Drainage" is a word gardeners use to describe how quickly water moves through the soil. Begonias have fleshy stems that store water, which makes them very sensitive to "wet feet" (roots sitting in soggy soil).

• In the Ground: If your garden soil stays wet for hours after a rain, it is best to plant begonias in raised beds or containers. You can improve garden soil by mixing in organic matter like compost or finely ground bark, which creates air spaces for the roots. For more on creating better drainage, see our guide.
• In Containers: Always use a high-quality, soil-less potting mix. These mixes are usually peat-moss or coir-based and include perlite to ensure the water drains away from the roots quickly. Avoid using heavy garden soil in pots, as it packs down too tightly.

Temperature and Airflow

Begonias are tropical at heart. They thrive in warm temperatures and high humidity. However, they also need good airflow to prevent fungal issues.

• The 60-Degree Rule: Avoid moving begonias outdoors until nighttime temperatures are consistently above 60°F. Cold soil and chilly nights can stun the plants and slow their growth.
• Spacing for Air: When planting in groups, leave enough space between plants so air can circulate. This simple step keeps the foliage dry and healthy.

How to Plant Begonias

Once the weather has warmed and you have selected your site, it is time to plant. The process differs slightly depending on whether you are starting with tubers or nursery-grown plants.

Starting Begonia Tubers

Starting tubers indoors about 8 to 12 weeks before the last frost gives you a significant head start on the blooming season. Start tuberous begonias indoors for earlier flowers.

1. Find the Indent: Look at the tuber and find the side that is slightly hollow or indented. This is the top where the sprouts will emerge. The rounded side is the bottom.
2. Set the Depth: Place the tubers in a tray of moist potting mix. You only need to tuck them in so the tops are level with or just slightly below the soil surface. Do not bury them deep, as this can lead to rot.
3. Warmth and Water: Keep the tray in a warm spot (around 70°F). Water sparingly at first—just enough to keep the soil from drying out completely. Once you see green sprouts, move the tray to a bright window or under grow lights.

Transplanting into the Garden or Containers

When it is finally time to move your begonias to their permanent summer home, follow these steps for a smooth transition:

• Prepare the Hole: Dig a hole that is slightly wider than the root ball of your plant.
• Check the Level: Set the plant in the hole so that the base of the stem is exactly level with the surrounding soil. Planting too deep can cause the stems to rot, while planting too shallow can cause the roots to dry out.
• Spacing: Space wax begonias about 6 to 8 inches apart for a dense look. Larger tuberous or cane begonias should be spaced 10 to 12 inches apart to allow for their mature spread.
• Initial Watering: Water the plants gently but thoroughly right after planting. This helps settle the soil around the roots and removes any large air pockets.

What to Do Next

• Check the weather forecast to ensure no late frosts are expected.
• Prepare your potting mix by pre-moistening it before filling containers.
• Label your varieties if you are planting different colors or types.

Essential Care for Healthy Growth

After your begonias are settled, the goal is to maintain steady, even growth. Because begonias are succulent-like, they respond best to a "deep but infrequent" approach to care.

Watering Correctly

Watering is the area where most gardeners feel unsure, but the rule is simple: water the soil, not the leaves.

• The Finger Test: Stick your finger about an inch into the soil. If it feels dry, it is time to water. If it feels moist, wait another day.
• Morning Routine: Watering in the morning allows any moisture that splashes onto the leaves to evaporate during the day. This is the best way to prevent powdery mildew, a common fungal issue.
• Container Care: Plants in containers dry out much faster than those in the ground. During the height of summer, you may need to check your pots daily.

Feeding for Blooms and Foliage

Begonias are relatively heavy feeders because they produce so much growth and so many flowers in a short time.

• Balanced Fertilizer: Use a balanced, water-soluble fertilizer once a month during the growing season.
• Potassium for Flowers: If you are growing tuberous begonias for their massive blooms, switching to a fertilizer slightly higher in potassium in mid-summer can encourage even more flowers.
• Avoid Over-Fertilizing: Too much nitrogen can lead to a lot of green leaves but very few flowers. Always follow the instructions on the product label.

Grooming and Pruning

One of the best things about many modern begonias is that they are "self-cleaning," meaning the old flowers fall off on their own. However, a little grooming can still go a long way.

• Pinching Back: If your cane or wax begonias start to look "leggy" (long stems with few leaves), pinch off the tips of the stems. This encourages the plant to branch out and become bushier.
• Removing Spent Foliage: If you see any yellowing or damaged leaves, snip them off at the base. This keeps the plant looking tidy and improves airflow.

"A healthy begonia is a result of consistent, moderate care. They don't need constant attention, just a steady environment and a watchful eye on soil moisture."

Humidity and Indoor Care

If you are growing Rex begonias or keeping begonias as houseplants, humidity becomes a major factor. Homes with central heating or air conditioning can often be too dry for these tropical natives.

Boosting Humidity

When the air is too dry, the edges of begonia leaves often turn brown and brittle. You can solve this without constant misting, which can actually cause fungal problems.

• Pebble Trays: Fill a shallow tray with small stones and add water until it is just below the top of the stones. Set your begonia pot on the stones. As the water evaporates, it creates a humid microclimate right around the leaves.
• Grouping Plants: Plants naturally release moisture through their leaves. By grouping several begonias together, you create a pocket of higher humidity that benefits all of them.
• The Right Room: Bathrooms and kitchens naturally tend to be more humid than living rooms or bedrooms, making them excellent spots for foliage begonias.

Indoor Lighting

Inside the house, begonias need bright but indirect light. A window facing east or west is usually ideal. If you only have a south-facing window, place the plant a few feet back from the glass or use a sheer curtain to soften the sunlight. If the stems start reaching toward the window and looking thin, the plant needs more light.

Overwintering Your Begonias

As the days get shorter and temperatures drop in the fall, you have a choice: treat your begonias as annuals and start fresh next year, or save them for the following season.

Saving Tuberous Begonias

In late autumn, usually after the first light frost has blackened the foliage, it is time to bring tuberous begonias indoors.

1. Lift the Tubers: Carefully dig up the tubers or remove them from their pots.
2. Dry Them Out: Cut the stems back to about an inch and let the tubers sit in a dry, shaded spot for a few days until the outer skin feels dry.
3. Storage: Place the tubers in a box filled with dry peat moss, perlite, or even shredded paper. Store them in a cool, dark, frost-free place like a basement or closet where temperatures stay around 40°F to 50°F.
4. Check Periodically: Once a month, check the tubers to make sure they aren't shriveling up or showing signs of mold.

Bringing Other Begonias Inside

Wax, Cane, and Rex begonias do not go dormant like tuberous types. You can bring them inside to live as houseplants for the winter.

• The Transition: Bring them inside before the nighttime temperatures drop below 50°F.
• Pest Check: Inspect the leaves and soil for any hitchhiking garden pests before bringing them into your home. A gentle spray of water can help clean the foliage.
• Reduced Water: Plants grow much slower in the winter due to lower light levels. Reduce your watering and stop fertilizing until the spring when you see new growth starting again. If you want a broader overview of begonia care and storage, read All About Begonias.

Simple Solutions for Common Issues

Gardening is a learning process, and occasionally your begonias might show signs that they aren't perfectly happy. Most issues are easy to resolve by adjusting one variable at a time.

Powdery Mildew

This looks like a light dusting of white flour on the leaves. It usually happens when the air is stagnant and the leaves stay wet for too long.

• The Fix: Increase the space between your plants to improve airflow and always water at the base of the plant. If the problem persists, remove the most affected leaves.

Leaf Drop or Yellowing

If your begonia is dropping leaves or they are turning yellow, it is usually a sign of a watering issue.

• The Fix: Most often, this is caused by overwatering. Check the drainage holes in your pot to make sure they aren't clogged. If the soil is soggy, let it dry out completely before watering again. If the soil is bone-dry and the plant is wilting, it simply needs a more regular watering schedule.

Slow Growth

If your begonias aren't growing as fast as you expected, they might be too cold or need a bit of food.

• The Fix: Ensure they are in a spot that stays above 60°F. If the temperature is fine, try applying a half-strength dose of liquid fertilizer to give them a gentle boost.

Creating Beautiful Displays

Begonias are incredibly versatile in the landscape. Because they come in so many shapes and sizes, they can fill almost any role in a garden design.

Container Combinations

Begonias are the perfect "filler" or "thriller" in the classic "Thriller, Filler, Spiller" container recipe. For more summer blooming bulbs for containers, start here.

• The Thriller: Use a tall Cane begonia in the center of a pot to provide height and structure.
• The Filler: Surround it with Rex begonias for colorful foliage or wax begonias for a constant carpet of flowers.
• The Spiller: Use trailing tuberous begonias or varieties like "Dragon Wing" to spill over the edges of the container, softening the look.

Landscape Edging

Wax begonias are unmatched for creating clean, colorful edges along a walkway or flower bed. Because they stay compact and uniform, they provide a sense of order and bright color that lasts from late spring until the first frost.

Shade Garden Companions

Begonias play well with other shade-loving plants. We often suggest pairing them with:

• Ferns: The delicate, lacy texture of ferns provides a beautiful contrast to the bold, waxy leaves of begonias.
• Hostas: Large-leaved hostas and colorful Rex begonias create a high-contrast foliage display that doesn't even need flowers to look stunning.
• Coleus: Both plants love the shade and come in an endless array of colors, allowing you to create custom color palettes.

Conclusion

Begonias are one of the most rewarding plants you can add to your garden or home. Their ability to bring high-impact color and intricate patterns to shaded areas makes them a favorite for gardeners everywhere. By matching the variety to the right location, providing well-drained soil, and watering with a gentle touch, you can enjoy their beauty throughout the entire growing season.

We at Longfield Gardens are proud to help you succeed in your gardening journey. Whether you are planting your very first tuber or expanding an existing collection, remember that gardening is a rewarding process of observation and care. If you want to know more about how we stand behind our plants, read About Us & Our Guarantee.

• Choose the right begonia for your light levels (sun vs. shade).
• Prioritize drainage to keep roots healthy.
• Wait for warm weather before planting outside.
• Enjoy the nonstop color and unique foliage patterns.

"The secret to beautiful begonias isn't a magic trick; it's simply giving them the warmth and drainage they crave."

If you are ready to start your shade garden transformation, we invite you to explore our selection and find the perfect varieties for your space. Happy gardening!

FAQ

Do begonias need sun or shade?

Most begonias thrive in partial shade or filtered light. They love bright conditions but need protection from the harsh, direct afternoon sun, which can scorch their leaves. Varieties with darker or bronze-colored foliage generally tolerate more sunlight than those with light green leaves.

How often should I water my begonias?

You should water begonias whenever the top inch of soil feels dry to the touch. It is important to water the soil directly and avoid getting the foliage wet to prevent fungal issues. Always ensure your pots have drainage holes, as begonias do not like to sit in soggy soil.

Are begonias perennials or annuals?

Begonias are tender perennials, meaning they can live for many years in warm, frost-free climates (USDA zones 9-11). In colder regions, they are typically grown as annuals or brought indoors for the winter. Tuberous begonias can be dug up and stored as dormant tubers to be replanted the following spring.

Why are my begonia leaves turning brown and crispy on the edges?

This is usually caused by low humidity or too much direct sunlight. If the plant is outdoors, move it to a shadier spot. If it is an indoor plant, try increasing the humidity around it by using a pebble tray or grouping it with other plants to create a more favorable microclimate.