Table of Contents
- Introduction
- Why Spacing Matters for Begonias
- Spacing for Tuberous Begonias
- How to Space Wax Begonias
- Spacing for Specialty Begonias
- Begonia Spacing in Containers and Hanging Baskets
- How Soil and Water Impact Your Spacing Choices
- Simple Steps for Planting Begonia Tubers
- Managing Spacing as Plants Mature
- Choosing the Right Location for Success
- Conclusion
- FAQ
Introduction
There is a special kind of excitement that comes with transforming a shady corner of the yard into a vibrant splash of color. Begonias are the perfect partner for this transformation because they offer some of the most reliable and brilliant blooms in the gardening world. Whether you are looking for the massive, rose-like flowers of tuberous begonias or the steady, season-long carpet of color provided by wax begonias, these plants are a joy to grow. At Longfield Gardens, we want to make sure your gardening experience is as rewarding as possible by helping you get the basics right from the very start. Browse our begonia flower bulbs to see the range available.
This guide is designed to help you understand exactly how much space your begonias need to thrive. We will cover the specific spacing requirements for different varieties and explain why "elbow room" is so important for plant health. You will also find practical tips for planting in both garden beds and containers. By following these simple spacing rules, you can ensure your begonias have the airflow and light they need to produce spectacular blooms all summer long.
Why Spacing Matters for Begonias
When you first bring home a small begonia transplant or a firm, dormant tuber, it can be tempting to plant them very close together. We all want that "full" look immediately. However, giving your plants the right amount of space is one of the easiest ways to ensure they stay healthy throughout the entire growing season. For a broader overview of the plant, see All About Begonias.
Proper spacing is primarily about airflow. Begonias have succulent stems and lush foliage that hold a lot of moisture. If they are crowded too tightly, air cannot move freely between the leaves. This creates a humid environment where powdery mildew or other fungal issues can start. By following our spacing recommendations, you create a natural breeze-way that keeps the foliage dry and the plants vigorous.
Beyond health, spacing also affects how your begonias look. When a plant has enough room, it can grow into its natural shape. A tuberous begonia that is given its own space will develop a sturdy, mounded form with flowers visible from all sides. If they are too close, they may begin to compete for light, causing them to stretch and become "leggy" rather than full and lush.
Key Takeaway: Correct spacing prevents disease by improving airflow and allows each plant to reach its full, beautiful potential without competing for light or nutrients.
Spacing for Tuberous Begonias
Tuberous begonias are the stars of the shade garden. They are famous for their large, dramatic flowers that can sometimes reach the size of a dessert plate. Because these plants focus so much energy on producing big blooms and thick stems, they need a specific amount of room to breathe. If you want to browse more big-flowered options, start with Upright Double Begonias.
Upright Tuberous Begonias
For most upright tuberous begonias, such as the popular Nonstop series or our large-flowered "Dinnerplate" varieties, you should aim for a spacing of 10 to 12 inches apart. This measurement is taken from the center of one plant to the center of the next.
This 12-inch gap might look a bit wide when you first plant your tubers, but begonias are surprisingly fast growers once the weather warms up. Within a few weeks, the foliage will expand to fill those gaps, creating a seamless look without the plants actually pressing against each other. If you are planting in a very humid climate, leaning toward the 12-inch mark is a smart move to further encourage airflow.
Trailing and Hanging Basket Begonias
Trailing begonias, often listed as "Pendula" types, are designed to spill over the edges of pots and walls. In a garden bed or along a retaining wall, these should also be spaced about 10 to 12 inches apart. While they do grow outward and downward, their root systems and the "crown" of the plant still require that same footprint to stay healthy. A variety like Begonia Hanging Pink Balcony is a good example of that cascading habit.
Spacing by Variety Type:
- Dinnerplate Begonias: 12 inches apart.
- Nonstop Begonias: try Begonia Non Stop Mix - Bulk Offer for a bulk planting.
- Fimbriata (Fringed) Begonias: 10 inches apart.
- Picotee Begonias: 10 to 12 inches apart.
How to Space Wax Begonias
Wax begonias, also known as bedding begonias, are the workhorses of the summer garden. They are much smaller than tuberous varieties and are typically grown as annuals to create borders, edges, or mass plantings. Because they are more compact, you can plant them much closer together. If you want a deeper look at how begonia light needs change by type, see Are Begonias Shade Plants? Light Tips for Best Blooms.
For a classic "carpet of color" look in a garden bed, we recommend spacing wax begonias 6 to 9 inches apart. If you want a solid line of color along a walkway fairly quickly, 6 inches is a great choice. If you are willing to wait a few extra weeks for the plants to knit together, 9 inches is perfectly fine and saves you a bit on the number of plants you need to buy.
Wax begonias are generally more resistant to heat and sun than their tuberous cousins. This resilience means they handle being slightly closer together quite well. However, even with these tough little plants, you should avoid "paving" the ground with them. A little bit of space between the mounds of foliage ensures that the lower leaves stay green and healthy instead of turning yellow from a lack of light.
Spacing for Specialty Begonias
While wax and tuberous begonias are the most common, many gardeners are falling in love with specialty types like Rex begonias and Cane begonias (such as the Angel Wing varieties). These have different growth habits that require a slightly different approach to spacing.
Rex Begonias
Rex begonias are grown primarily for their incredible foliage. They have wide, patterned leaves that can create a stunning mosaic in the garden. Because these leaves can get quite large, Rex begonias should be spaced 12 inches apart. This allows each leaf to lay flat and catch the light without being shaded by a neighbor.
Cane-Type Begonias
Cane begonias grow upright on sturdy, bamboo-like stems. Depending on the specific variety, these can get quite tall. For the types typically used in summer beds, space them 12 to 15 inches apart. This gives the base of the plant room to branch out, which results in a fuller, more attractive specimen. If your planting site gets a little more sun, Begonia Upright Double Bertini is a useful option to know about.
What to Do Next:
- Measure your planting area to determine how many plants or tubers you need.
- Mark your spots with a small bamboo stake or a handful of sand before digging.
- Ensure you have a 10-12 inch gap for large varieties and a 6-9 inch gap for bedding types.
Begonia Spacing in Containers and Hanging Baskets
When you plant in containers, the rules change slightly. In a pot, we often want an "instant" look, and because containers are usually moved to areas with better controlled conditions, we can get away with tighter spacing. For more ideas, see How to Keep Container Plants Looking Their Best.
In Large Pots and Urns
If you are planting tuberous begonias in a 12-inch pot, you can comfortably fit three tubers. This places them about 4 to 6 inches apart. While this is closer than the garden spacing, the fact that the plants are elevated and often exposed to more breeze allows for this density. The plants will quickly fill the pot and create a beautiful, mounded display of flowers.
In Hanging Baskets
For a standard 10-inch or 12-inch hanging basket, two to three trailing begonia tubers are ideal. If you use three, space them in a triangle pattern near the edges of the pot. This encourages them to grow outward and "spill" over the sides. A plant like Begonia Upright Double Picotee White is another good container option.
Spacing in Window Boxes
Window boxes are usually narrow, so a single row of plants is best. Space tuberous begonias about 8 inches apart in a window box. For wax begonias, you can go as close as 4 to 6 inches to create a dense, overflowing look that persists all summer.
How Soil and Water Impact Your Spacing Choices
The environment you provide will influence how your begonias grow and, consequently, how they fill their assigned space. Begonias thrive in soil that is rich, light, and very well-draining. We often describe ideal begonia soil as "spongy."
If your soil is very heavy or holds a lot of water, you should actually increase your spacing. Plants in heavy soil are at a higher risk for rot, so giving them extra room for air circulation helps the soil surface dry out between waterings. Conversely, if you have very light, sandy soil and you stay on top of watering, the plants will grow quite fast, and you can stick to the standard 10-12 inch recommendations.
When it comes to watering, the goal is to keep the soil consistently moist but never soggy. At Longfield Gardens, we suggest watering the soil around the base of the plant rather than splashing the leaves. Keeping the foliage dry is the best partner to proper spacing in the fight against garden mildew.
Simple Steps for Planting Begonia Tubers
Once you know how far apart to plant, the actual process is quite simple. Follow these steps to get your begonias off to a great start:
- Check the Temperature: Begonias are tropical plants. Wait to plant them outdoors until the soil is warm and nighttime temperatures are consistently above 50°F (or 60°F for the best results).
- Identify the Top: Begonia tubers have a "cup" side and a "rounded" side. The side with the hollow or indentation is the top where the sprouts will emerge.
- Set the Depth: Dig a shallow hole. Place the tuber in the hole so the top is just barely covered with about an inch of soil. Planting too deep can lead to the tuber rotting before it has a chance to grow.
- Measure the Distance: Use a ruler or a hand trowel to measure 10 to 12 inches from the center of the first tuber before placing the next one. To check your growing zone, use the Hardiness Zone Map.
- Water Lightly: Give the area a light drink of water to settle the soil. Avoid overwatering at this stage; the tuber only needs a little moisture until it starts sending up green shoots.
Managing Spacing as Plants Mature
Gardening is a dynamic process. Even with the best planning, sometimes a specific variety grows more vigorously than expected. If you notice that your begonias are starting to overlap significantly and the lower leaves are looking pale, you can take a few simple steps to help.
First, you can gently "pinch" the tips of the stems. This encourages the plant to grow bushier rather than longer, which can help manage the spread. Second, if the plants are truly crowded, you can carefully remove a few leaves from the center of the grouping to let light and air in. A full, upright variety like Begonia Upright Double Superba Pink can help you visualize how quickly a planting fills its space.
Remember that begonias are quite forgiving. If you find you planted them too close this year, simply make a note to give them an extra two inches of space next season. Every garden is a learning experience, and observing how the plants interact with your specific microclimate is part of the fun.
Choosing the Right Location for Success
Spacing only works if the plants are in a location where they want to grow. Begonias are famous shade lovers, but "shade" can mean many things. For more ideas on matching plants to low-light spots, browse Summer Bulbs for Shady Gardens.
Most begonias prefer "dappled" or "filtered" sunlight. This is the kind of light you find under a tall tree or on a porch that gets morning sun but is protected from the harsh afternoon heat. If you plant begonias in a spot that is too dark, they will grow slowly and may not fill the space you’ve allocated for them. If the spot is too sunny, the leaves may scorch.
The rule of thumb is: the hotter the climate, the more shade they need. In cooler northern climates, begonias can handle quite a bit of sun as long as they have plenty of water. Matching the right light to the right spacing ensures that your begonias will grow into the lush, colorful display you imagined.
Key Takeaway: Balance your spacing with the right light conditions. In deep shade, plants grow slower and may need tighter spacing; in ideal dappled light, they will fill out 12-inch gaps with ease.
Conclusion
Getting the spacing right is one of those small gardening details that makes a massive difference in the health and beauty of your begonias. By giving your tuberous begonias 10 to 12 inches of room and your wax begonias 6 to 9 inches, you are setting the stage for a season filled with lush foliage and spectacular flowers. At Longfield Gardens, we believe that gardening should be a relaxing and rewarding part of your life. When you start with quality tubers and follow these simple guidelines, you are well on your way to a stunning shade garden. If you're planning an order, our Shipping Information page can help you time delivery to your zone.
- Always prioritize airflow to keep your begonias healthy and rot-free.
- Adjust your spacing based on the specific variety and whether you are planting in the ground or in a pot.
- Wait for warm weather before moving your begonias into their outdoor home.
We are here to help you grow a more beautiful world, one bloom at a time. Take a moment to enjoy the process, and soon your garden will be glowing with the unique charm that only begonias can provide.
FAQ
How far apart should I plant begonias in a window box?
In a window box, you can space begonias slightly closer than in the ground to create an overflowing look. For tuberous begonias, 8 inches apart is ideal, while wax begonias can be spaced every 4 to 6 inches. Ensure the box has good drainage to prevent the soil from becoming waterlogged.
What happens if I plant my begonias too close together?
Planting begonias too close can restrict airflow, which often leads to fungal issues like powdery mildew. It can also cause the plants to compete for light, making them grow tall and "leggy" rather than full and mounded. Giving them proper space ensures they stay healthy and produce the maximum number of flowers.
Can I plant different types of begonias together?
Yes, you can mix different begonia types as long as you respect their individual spacing needs. For example, you could plant an upright cane begonia in the center and surround it with wax begonias. Just make sure the taller variety doesn't completely shade out the smaller ones, and keep the spacing consistent with the larger plant's requirements. A mixed pair like Begonia Upright Double Roseform Pink & Picotee White is a good example of a cohesive planting.
Does the spacing change if I am planting in full sun?
In sunnier locations, begonias may grow more compactly but will require more frequent watering. You should stick to the standard spacing of 10 to 12 inches for tuberous varieties. The extra space helps prevent the soil around the roots from overheating and allows for better cooling airflow during the hottest part of the day.