How to Get Begonias to Grow: A Simple Success Guide

Table of Contents

1. Introduction
2. Understanding Different Types of Begonias
3. Finding the Right Place to Grow
4. How to Plant Begonia Tubers
5. Caring for Begonias Throughout the Season
6. Growing Begonias as Houseplants
7. How to Overwinter Your Begonias
8. Simple Propagation for More Plants
9. Common Challenges and Easy Wins
10. Conclusion
11. FAQ

Introduction

Few plants offer the vibrant, non-stop color and architectural beauty of begonias. Whether you are looking to brighten a shady porch with cascading blossoms or add dramatic, shimmering foliage to your indoor space, begonias are a rewarding choice for every gardener. At Longfield Gardens, we believe that gardening should be a joyful experience, and these versatile plants are one of the most reliable ways to achieve a stunning display with minimal stress.

In this guide, we will walk you through everything you need to know about how to get begonias to grow, from selecting the right variety for your space to the simple steps for planting and season-long care. For a broader overview, see our All About Begonias guide. We focus on the practical basics that ensure success for both beginners and experienced plant lovers. By understanding a few simple needs regarding light, water, and soil, you can enjoy a lush garden that blooms from early summer right through the first frost.

Successful begonia growing comes down to matching the plant’s tropical origins with your home environment. This post covers planting techniques, essential maintenance tips, and how to keep your plants thriving year after year. With the right approach, growing begonias is an achievable and highly satisfying project for any backyard or balcony.

Understanding Different Types of Begonias

Before you dig into the soil, it is helpful to know which type of begonia you are growing. While there are thousands of species, most home gardeners encounter four main groups. Each has a slightly different personality and growth habit.

Tuberous Begonias

These Tuberous Begonias are the showstoppers of the begonia world, known for their large, rose-like flowers and dramatic colors. They grow from a thickened underground stem called a tuber. Tuberous begonias are often used in hanging baskets or containers because many varieties have a beautiful trailing habit. Others grow upright, making them perfect for shaded garden beds.

Wax Begonias (Semperflorens)

Also known as fibrous begonias, these are the classic bedding plants seen in parks and borders. They have succulent, waxy leaves (green or bronze) and produce clusters of small white, pink, or red flowers. If you prefer pale blooms, browse our White Items collection. They are incredibly tough and can handle more sun than most other types.

Rex Begonias

If you love striking patterns and colors, Rex begonias are for you. These are grown primarily for their foliage, which can feature swirls of silver, purple, burgundy, and emerald green. If you like that palette, explore our Pink & Purples collection. While they do produce small flowers, the leaves are the main attraction. They are popular as both houseplants and shade-garden accents.

Cane Begonias (Angel Wing)

Named for their tall, bamboo-like stems and wing-shaped leaves, these begonias are elegant and upright. They often feature silver "polka dots" on their leaves and produce pendulous clusters of flowers. For cascading forms, our Hanging Begonias collection is a natural fit. They are frequently grown as indoor plants but enjoy a summer vacation on a shaded patio.

Key Takeaway: Identifying your begonia type helps you provide the right care. Tuberous types prioritize large blooms, Rex types focus on foliage, and Wax begonias are the most sun-tolerant.

Finding the Right Place to Grow

The most important rule for begonia success is putting the right plant in the right place. Begonias are tropical plants, meaning they love warmth and humidity but generally prefer to stay out of the harsh, midday sun.

Matching Light to Your Variety

Most begonias thrive in partial shade. This means they enjoy bright, indirect light or morning sun with protection during the hottest part of the afternoon.

• Tuberous and Rex Begonias: These prefer dappled light or full shade. Direct afternoon sun can scorch their delicate leaves and cause flowers to wilt.
• Wax Begonias: These are more adaptable. While they grow well in shade, they can also handle full sun if they receive enough water, especially in cooler climates.
• Indoor Begonias: Place them near a bright window with filtered light. A north- or east-facing window is usually the best spot to prevent leaf burn.

Soil and Drainage Basics

Begonias have fine, delicate roots that do not like to sit in "wet feet." This means drainage is your best friend. Whether you are planting in the ground or a container, the soil should be rich in organic matter but loose enough for water to move through it freely.

If your garden soil is heavy clay, it will hold too much water and might cause the stems to rot. You can improve drainage by adding compost or peat moss to the planting area. For containers, use a high-quality potting mix rather than garden soil. Potting mixes are designed to stay fluffy and allow for better airflow around the roots.

Temperature Requirements

Because they are tropical, begonias love the warmth. They are most comfortable when temperatures stay above 60°F. If the thermometer dips below 45°F, the plants may stop growing or show signs of cold damage. Always wait until the danger of frost has completely passed and the soil has warmed up before moving your begonias outside for the season.

How to Plant Begonia Tubers

Many gardeners prefer starting with tubers because it is a cost-effective way to get large, spectacular plants. For a compact, continuous display, the Non Stop Begonias collection is another good fit. Planting tubers requires a little more patience than buying a nursery start, but the results are well worth the wait.

Timing Your Planting

You can get a head start on the season by "starting" your tubers indoors about 8 to 12 weeks before the last frost date. For more seasonal timing tips, see our Tips for Growing Tuberous Begonias. This gives the plants time to develop a strong root system so they are ready to bloom shortly after moving outside. If you prefer to plant directly in the garden, wait until the soil is consistently warm.

Step-by-Step Tuber Planting

1. Identify the Top: Look at the tuber. One side will be slightly indented or "hollowed out" like a bowl. This is the top where the sprouts will emerge. The rounded side is the bottom.
2. Prepare the Pot: Use a shallow tray or individual pots with drainage holes. Fill them with damp potting mix.
3. Set the Tuber: Place the tuber on the surface of the soil with the indented side facing up. Press it down gently so it is nestled in, but do not bury it deeply. A light covering of about 1/2 inch of soil is sufficient.
4. Water Lightly: Give the soil a small drink to settle it. Avoid pouring water directly into the hollow of the tuber, as this can lead to rot.
5. Provide Warmth and Light: Place the pots in a warm spot (around 70°F) with bright, indirect light.

Spacing and Depth

When you are ready to move your begonias to their permanent summer home, space them about 8 to 12 inches apart. For a quick reference on garden spacing, see How Far Apart to Plant Begonias. This allows for plenty of airflow between plants, which helps prevent fungal issues later in the summer. If planting in a hanging basket, three tubers in a 12-inch basket will create a full, lush look.

What to do next:

• Check your local frost dates to plan your start time.
• Purchase a high-quality, well-draining potting mix.
• Set up a warm, bright indoor space for starting tubers.
• Inspect tubers for the "hollow" side before planting.

Caring for Begonias Throughout the Season

Once your begonias are established and growing, they are relatively low-maintenance. Success during the summer months is all about consistency.

Mastering the Art of Watering

Begonias prefer soil that stays consistently damp—think of a sponge that has been wrung out. The goal is to avoid the "roller coaster" of the soil being bone-dry one day and soaking wet the next. For more watering guidance, see How Often Do You Water a Begonia Plant?

• 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.
• Water at the Base: Always aim the water at the soil, not the leaves. Wet foliage, especially in the evening, can encourage powdery mildew.
• Morning is Best: Watering in the morning gives the plant plenty of moisture to handle the heat of the day and allows any accidental splashes on the leaves to dry in the sun.

Feeding Your Plants

Begonias are "heavy feeders," meaning they use a lot of energy to produce those constant blooms or lush leaves. To keep them performing their best, use a balanced, water-soluble fertilizer.

For tuberous begonias, a fertilizer with a slightly higher phosphorus count (the middle number on the label, such as 15-30-15) can help encourage more flower production. We recommend feeding your plants every two weeks throughout the growing season. If you are growing wax begonias in garden beds, a slow-release fertilizer applied at planting time is often enough to keep them happy all summer.

Grooming for Beauty

Most modern begonias are "self-cleaning," meaning the old flowers fall off on their own. However, you can help your plants look their best by occasionally removing any spent blooms or yellowing leaves. This practice, known as deadheading, keeps the plant looking tidy and prevents the old flowers from resting on the leaves and causing rot.

If your plants start to look "leggy" (long stems with few leaves at the base), do not be afraid to pinch them back. Snapping off the top inch or two of a stem encourages the plant to branch out, resulting in a bushier, fuller appearance.

Growing Begonias as Houseplants

Rex and Cane begonias are favorite houseplants because they bring a tropical feel to indoor spaces year-round. While the basics of light and soil remain the same, indoor environments present a few unique challenges.

Managing Humidity

Our homes, especially during the winter when the heat is on, tend to be very dry. Begonias love humidity. If the air is too dry, the edges of the leaves may turn brown and crispy. To help your indoor begonias feel at home, try these simple tips:

• Group Plants Together: Plants naturally release moisture through their leaves. Grouping them creates a small "microclimate" of higher humidity.
• Pebble Trays: Fill a shallow tray with pebbles and add water until it is just below the top of the stones. Place your plant pot on top. As the water evaporates, it humidifies the air directly around the leaves.
• Avoid Misting: While it seems helpful, misting can encourage fungal diseases and only provides a very temporary boost in humidity.

Airflow and Temperature

Indoors, begonias appreciate a steady temperature. Keep them away from cold drafts, such as air conditioning vents or drafty windows, as well as hot spots like radiators. Good airflow is also important to prevent mold, so avoid cramming them into a tight corner where the air stays stagnant.

Key Takeaway: For indoor begonias, humidity and bright, indirect light are the secrets to success. A pebble tray is an easy, low-tech way to keep leaves looking fresh.

How to Overwinter Your Begonias

One of the best things about begonias is that you can save them for next year. While they are annuals in most US climates, the tubers can be stored indoors during the winter and replanted the following spring.

Lifting Tuberous Begonias

When the weather begins to cool in autumn, your begonia will naturally start to slow down. The leaves may begin to yellow, signaling that it is time for a rest.

1. Stop Watering: Reduce watering in late September to encourage the plant to go dormant.
2. Dig After the First Light Frost: A light frost will blacken the foliage but won't hurt the tuber underground. Once this happens, carefully dig up the tubers.
3. Dry Them Out: Cut the stems back to about an inch above the tuber. Let the tubers sit in a dry, shady spot for a few days until the soil clinging to them is easy to brush away.
4. Storage: Place the clean, dry tubers in a paper bag or a box filled with peat moss or sawdust. Store them in a cool, dark, and dry place (like a basement or crawlspace) where temperatures stay between 40°F and 50°F.

Saving Other Varieties

Wax, Rex, and Cane begonias do not have tubers, so they cannot be stored in a box. If you want to keep them, you must bring the entire plant inside before the first frost and treat it as a houseplant for the winter. They may drop some leaves as they adjust to the lower light levels indoors, but they will bounce back when spring returns.

Simple Propagation for More Plants

Begonias are famously easy to propagate, which is a fun and free way to expand your garden. The most common methods are stem cuttings and leaf cuttings.

Stem Cuttings

This works well for Wax and Cane begonias.

• Cut a 4-inch piece of a healthy stem, making the cut just below a leaf node (the bump where a leaf attaches).
• Remove the lower leaves.
• Place the stem in a glass of water or directly into a pot of moist potting mix.
• In a few weeks, you will see new roots forming.

Leaf Cuttings

This is a fascinating method used primarily for Rex begonias.

• Take a healthy, mature leaf and cut it into several pieces, making sure each piece has a main vein.
• Place the pieces on top of moist soil and keep them in a humid environment (like a tray with a clear plastic lid).
• Tiny new "baby" plants will eventually sprout from the veins of the leaf.

What to do next:

• Try a stem cutting from your favorite plant in late summer.
• Use a clear container so you can watch the roots develop.
• Keep new cuttings in a bright spot, but out of direct sun.

Common Challenges and Easy Wins

Even with the best care, you might run into a few hurdles. The key is to address them early with simple, effective steps.

Preventing Rot

The most common issue with begonias is stem or root rot, usually caused by too much water. If you notice a stem turning mushy at the base, it is a sign the soil is staying too wet. The fix is simple: let the soil dry out more between waterings and ensure your pot has excellent drainage.

Dealing with Powdery Mildew

This looks like a dusting of white flour on the leaves. It usually happens when the air is humid but stagnant. To prevent it, give your plants plenty of space for air to circulate and avoid getting the leaves wet when you water. If you see it, you can often manage it by removing the affected leaves and improving the airflow around the plant.

Encouraging More Blooms

If your begonia is healthy but not producing many flowers, it might need more light or more food. Try moving it to a slightly brighter spot (still avoiding direct afternoon sun) and ensure you are using a phosphorus-rich fertilizer every two weeks.

Conclusion

Getting begonias to grow is a rewarding journey that adds incredible beauty to your home and garden. By focusing on the basics—choosing the right spot, providing well-drained soil, and maintaining consistent moisture—you can enjoy these tropical treasures all season long. Whether you are growing them for their massive, colorful blooms or their intricate, artistic foliage, begonias are a testament to how a little care can yield spectacular results.

At Longfield Gardens, we are dedicated to helping you succeed. We provide high-quality tubers and plants that are true to variety and handled with care. We stand behind our products with a 100% quality guarantee: we ensure your items arrive in prime condition, and if there are any performance issues in your first growing season, we are here to help with solutions.

• Start tubers indoors for an early summer display.
• Always check soil moisture before watering.
• Feed regularly with a balanced fertilizer for best results.
• Overwinter tubers in a cool, dry place to enjoy them next year.

The next step is simple: choose a variety that speaks to you and find a beautiful pot to get started. Gardening is a wonderful way to connect with nature, and begonias are the perfect partner for your creative journey.

FAQ

How much sun do begonias actually need to bloom?

Most begonias bloom best in partial shade, receiving about 4 to 6 hours of indirect or filtered light daily. While wax begonias can handle more direct sun, tuberous and foliage types like Rex begonias prefer to be shielded from the intense afternoon sun to prevent leaf scorch.

Can I grow begonias indoors all year round?

Yes, many varieties like Rex and Angel Wing begonias make excellent year-round houseplants. The key to indoor success is providing bright, indirect light and maintaining higher humidity levels, which can be achieved by using a pebble tray or grouping plants together.

Why are my begonia leaves turning yellow and falling off?

Yellowing leaves are most often a sign of overwatering or poor drainage, which can lead to root rot. Make sure the top inch of soil is dry before watering again, and always ensure your containers have functional drainage holes.

Do I need to dig up my begonias every winter?

If you live in a climate where temperatures drop below freezing, you will need to dig up tuberous begonias if you wish to save them for next year. For other types like Wax or Rex begonias, you must bring the entire plant indoors before the first frost, as they cannot survive freezing temperatures.