Introduction
There is nothing quite like the sight of a lush hanging basket overflowing with vibrant blooms. Trailing begonias are a favorite for this very reason, offering a cascade of color that lasts from midsummer right through the first frost. Whether you have a shady porch that needs a pop of brightness or a sunny patio that needs a vertical accent, these plants are a reliable and rewarding choice for any gardener.
At Longfield Gardens, we want to help you achieve the best results possible with your summer-blooming bulbs for containers. This guide will walk you through everything you need to know about planting begonia hanging baskets, from choosing the right varieties to ensuring they thrive all season long. It is a straightforward process that even a beginner can master with just a little bit of preparation.
By following a few simple steps, you can transform dormant tubers into a breathtaking display of flowers. This article covers timing, pre-sprouting, soil selection, and planting techniques to help you create a professional-looking basket at home. For a broader overview of begonia types and care, the All About Begonias guide is a helpful next step.
Choosing the Best Begonias for Hanging Baskets
The first step to a beautiful basket is selecting the right type of begonia. Not all begonias grow the same way, so it is important to choose a variety that naturally wants to spill over the edges of a container. While upright begonias look lovely in garden beds or upright pots, trailing begonias are the stars of the hanging basket world.
Trailing vs. Upright Begonias
When you look at begonia tubers, they may all look similar, but their growth habits vary significantly. Trailing begonias, often labeled as "Pendula" or "Cascade" types, have stems that grow outward and then downward. This creates a soft, flowing look that hides the sides of the basket.
Upright begonias grow more like a small shrub. If you plant these in a hanging basket, they will grow straight up. While this can look nice if the basket is hung low, it won't provide that classic cascading effect. For a full, rounded look, we recommend sticking with trailing varieties.
Popular Varieties for Baskets
There are several types of trailing begonias that perform exceptionally well in containers:
- Cascade Begonias: These are known for having very large, double flowers. They come in shades of red, pink, yellow, and white. They create a high-impact look with heavy blooms.
- Pendula Begonias: These typically have slightly smaller, more delicate flowers but produce them in massive quantities. They are very reliable and offer a soft, romantic appearance.
- Odorata Begonias: If you want fragrance, look for these varieties. They trail beautifully and offer a sweet, subtle scent that is rare in the begonia world.
- Bertini Begonias: These have a more vigorous growth habit and produce pendulous, bell-shaped flowers. They are excellent for larger baskets where you want a lot of coverage.
Selecting Quality Tubers
When your order arrives from us, take a moment to look at your tubers. A healthy begonia tuber should feel firm and heavy for its size. It may look like a dry, brown puck or a small bowl, but inside is all the energy the plant needs to start growing. Do not worry if they look a bit dusty or hairy; this is normal for a dormant tuber.
Key Takeaway: Always choose trailing or "pendula" varieties for hanging baskets to ensure a cascading growth habit. Check that tubers are firm and healthy before you begin planting.
When to Start Your Begonia Tubers
Timing is everything when it comes to begonias. Because they are tropical plants, they are very sensitive to cold temperatures. However, they also take a while to get going. If you wait until the weather is warm to plant them directly outside, you might not see flowers until late in the summer.
Starting Indoors
The best way to get a head start is to begin the process indoors. Most gardeners start their begonia tubers about 8 to 12 weeks before the last expected frost in their area. This gives the plants plenty of time to develop a strong root system and start producing leaves before they ever face the outdoor elements. If you want more timing help, see When to Plant Begonias in Hanging Baskets.
In most parts of the United States, this means starting your tubers in late February or March. By the time the nights are consistently warm in May or June, your baskets will already be well-established and ready to bloom.
The 50°F Rule
Begonias do not like the cold. It is a good rule of thumb to keep them indoors until nighttime temperatures are reliably above 50°F. If you put them out too early, the cold can stunt their growth or cause the tubers to rot in cold, wet soil. If an unexpected late frost is predicted, be sure to bring your hanging baskets inside for the night.
Step-by-Step: Pre-Sprouting Your Begonia Tubers
You can plant tubers directly into your hanging baskets, but "pre-sprouting" them is a great way to ensure every tuber is healthy and growing before it takes up permanent residence in a pot. This also helps you see exactly where the sprouts are coming from so you can plant them at the right depth.
How to Pre-Sprout
- Find a Shallow Tray: Use a seed tray or a shallow plastic container with drainage holes.
- Add Growing Mix: Fill the tray with about 2 or 3 inches of light, moist potting soil or peat moss.
- Position the Tubers: Place the tubers on top of the soil. Begonia tubers have a "cupped" or concave side and a rounded side. The cupped side should face up. This is where the sprouts will emerge.
- Space Them Out: Leave about an inch of space between each tuber so the roots don't get tangled.
- Provide Light and Warmth: Place the tray in a warm spot (around 70°F) with indirect light. A windowsill that doesn't get harsh, direct afternoon sun is perfect.
- Water Lightly: Keep the soil moist but never soggy. You want to wake the tuber up, not drown it.
Within two to four weeks, you should see small red or green buds appearing in the center of the "bowl" of the tuber. Once these sprouts are about an inch tall, they are ready to be moved into their final hanging baskets.
Preparing Your Hanging Baskets
While your tubers are sprouting, you can get your baskets ready. The type of basket you choose and the soil you put in it will play a big role in how well your begonias grow.
Choosing a Basket
Hanging baskets come in many styles, from plastic to wire with liners. For begonias, wire baskets with coir (coconut fiber) or moss liners are a popular choice. They allow for excellent drainage and give the basket a natural look. However, plastic baskets are also great because they hold moisture longer, which can be helpful during the heat of summer.
If you use a wire basket with a coir liner, you may want to place a small piece of plastic (like a cut-up grocery bag with holes poked in it) at the bottom before adding soil. This helps slow down drainage just enough so the basket doesn't dry out instantly on a hot day.
Using the Right Soil
Never use "garden soil" or "topsoil" in a hanging basket. It is too heavy and will pack down, preventing air from reaching the roots. Instead, use a high-quality potting mix. Look for a mix that contains peat moss, perlite, or vermiculite. These ingredients keep the soil light and fluffy while helping it retain the right amount of moisture.
We suggest adding a handful of compost to your potting mix for extra nutrients. Since hanging baskets have a limited amount of soil, the plants will quickly use up the available food, so starting with a rich mix is a smart move.
What to Do Next: Basket Preparation
- Choose a 12-inch or 14-inch basket for the best results.
- Ensure your basket has adequate drainage holes.
- Fill the basket about two-thirds full with a light, dampened potting mix.
- Pre-moisten the soil before planting so it doesn't "shed" water later.
How to Plant Your Begonias in the Basket
Once your tubers have sprouted and your basket is prepared, it is time to plant. This is the most exciting part, as you are finally setting the stage for the summer show.
Spacing and Quantity
For a 12-inch hanging basket, we recommend planting three tubers. This provides enough room for each plant to grow without them becoming overly crowded. If you have a larger 14-inch or 16-inch basket, you can increase this to four or five tubers. For more spacing tips, How Many Begonia Plants Per Hanging Basket? is a useful reference.
Spacing them evenly around the basket ensures that the flowers will cascade from all sides, creating a full, 360-degree display. If the basket will be hanging against a wall, you might choose to plant them more toward the front and center.
Planting Depth
One of the most common questions we get is how deep to plant the tubers. Begonias don't like to be buried deep. If you want a deeper look at this step, How Deep to Plant Tuberous Begonias in Hanging Baskets covers it in detail.
- Make a Small Indent: In your prepared basket, make a small hole for each tuber.
- Place the Tuber: Set the sprouted tuber into the hole with the sprouts facing up.
- Cover Lightly: Cover the tuber with about 1 inch of potting mix. The sprouts should be just barely covered or just peeking through the surface.
- Firm Gently: Press the soil down very lightly just to ensure there are no large air pockets around the roots.
Initial Watering
After planting, give the basket a gentle watering. Use a watering can with a "rose" attachment or a gentle spray setting on your hose. You want to settle the soil around the tubers without washing them out of place. After this initial watering, wait until the top inch of soil feels dry before watering again. Overwatering at this early stage is a common mistake that can lead to rot.
Key Takeaway: Space 3 tubers in a 12-inch basket and cover them with only one inch of soil. Proper spacing and depth are the secrets to a full, healthy display.
Caring for Your Hanging Baskets All Summer
Once your begonias are planted and moved outdoors, they need consistent care to keep them looking their best. Hanging baskets dry out much faster than plants in the ground, so you will need to be attentive.
Light Requirements
Most begonias prefer filtered light or partial shade. They are the perfect solution for areas that don't get enough sun for petunias or geraniums. If you're deciding between brighter and shadier spots, Are Begonias a Sun or Shade Plant? can help.
- Morning Sun: A spot that gets 3 or 4 hours of gentle morning sun is often ideal.
- Filtered Shade: Under a porch roof or beneath the canopy of a large tree works very well.
- Avoid Harsh Afternoon Sun: The hot, direct sun between 12:00 PM and 4:00 PM can scorch the leaves and cause the flowers to wilt.
If you notice the leaves looking pale or yellow, they might be getting too much sun. If the plants are "leggy" with very few flowers, they might need a bit more light.
Watering Correctly
Watering is the most important part of begonia care. Because hanging baskets are exposed to air on all sides, they lose moisture quickly. In the height of summer, you may need to water your baskets every day.
The best way to tell if your begonias need water is to use your finger. Stick it into the soil up to the first knuckle. If it feels dry, it is time to water. If it feels damp, wait a day. When you water, do so thoroughly until water runs out of the drainage holes at the bottom. This ensures the roots at the very bottom of the pot are getting a drink.
Feeding Your Plants
Begonias are "heavy feeders," meaning they need a lot of nutrients to produce those big, beautiful blooms all season. Since watering frequently washes nutrients out of the soil, you need to replace them.
We recommend using a liquid fertilizer every two weeks. A balanced fertilizer or one designed for flowering plants (higher in phosphorus) works best. Always follow the instructions on the product label. If you notice the plant has lots of green leaves but no flowers, you might be using a fertilizer with too much nitrogen; switch to a "bloom booster" formula to encourage more blossoms.
Grooming and Deadheading
To keep your basket looking tidy, it is a good idea to remove spent flowers and any yellowing leaves. This is called "deadheading." While many modern begonias are "self-cleaning" (the flowers fall off on their own), picking off the old stems helps the plant focus its energy on creating new buds.
Be careful when handling your begonias. Their stems are quite brittle and can snap easily. If a stem does break off, don't worry—the plant will usually sprout new growth from the base.
Simple Steps for End-of-Season Care
One of the best things about tuberous begonias is that they are not a "one and done" plant. You can save the tubers and grow them again next year. As the weather cools in the fall, the plants will naturally begin to slow down.
Preparing for Dormancy
When the leaves start to turn yellow and the plant stops flowering, it is entering dormancy. This usually happens after the first light frost, or as the days get significantly shorter in October.
- Reduce Water: Stop watering the basket and allow the soil to dry out.
- Cut Back: Once the foliage has died back, you can cut the stems off about an inch above the tuber. Often, the stems will simply pull away from the tuber with a gentle tug.
- Lift the Tubers: Carefully dig the tubers out of the dry soil. Brush off any excess dirt, but do not wash them with water.
- Dry Them: Let the tubers sit in a cool, dry place for a few days to "cure."
Storage
Store your tubers in a cardboard box or a paper bag filled with slightly damp peat moss or sawdust. Keep them in a dark, frost-free place where the temperature stays around 40°F to 50°F. A cool basement or a crawlspace is usually perfect. Check on them once or twice during the winter to make sure they aren't shriveling up or rotting. If they look very dry, a tiny mist of water on the peat moss can help.
Next spring, you can pull them out and start the process all over again!
FAQ
How many begonia tubers should I plant in a 12-inch hanging basket?
For a full and lush look, we recommend planting three tubers in a 12-inch basket. This gives each plant enough room to develop its root system while ensuring the foliage and flowers cover the entire container. If you use a larger 14-inch basket, you can increase this to four or five tubers.
Do begonia hanging baskets need full sun or shade?
Begonias generally prefer partial shade or filtered sunlight. They thrive in spots that receive gentle morning sun but are protected from the harsh, direct rays of the afternoon. If you place them in a spot with too much shade, they may produce fewer flowers; if they get too much hot sun, their leaves may scorch. For more on light choices, the Begonia Flower Bulbs for Sale collection can help you browse options.
Why are the flowers falling off my begonia before they wilt?
This is often a sign of a watering issue or extreme temperature stress. If the soil becomes bone-dry, the plant may drop its flowers to conserve moisture. Similarly, if the soil stays constantly soggy, the roots can't breathe, leading to bud drop. Try to keep the soil consistently moist, like a wrung-out sponge.
Which side of the begonia tuber should face up when planting?
Begonia tubers have a distinct shape that looks a bit like a shallow bowl or a thumbprint. The "cupped" or indented side should always face up. This is the side where the new sprouts will emerge. The smooth, rounded side should face down into the soil, as this is where the roots will grow.
Conclusion
Planting begonia hanging baskets is one of the most rewarding ways to add vertical interest and vibrant color to your home. By choosing trailing varieties, pre-sprouting your tubers, and providing the right balance of moisture and filtered light, you can enjoy a spectacular display that lasts for months. These plants offer a level of beauty and elegance that is hard to match, and the fact that you can save the tubers for next year makes them an excellent value for any gardener.
- Start tubers indoors 8-12 weeks before the last frost.
- Plant with the "cupped" side facing up in high-quality potting mix.
- Keep the soil moist but not soggy and fertilize every two weeks.
- Protect your plants from harsh afternoon sun and cold nights.
If you are ready to start your own summer display, we invite you to explore the Hanging Begonias collection at Longfield Gardens. With a little bit of patience and care, you will soon have a stunning hanging basket that is the envy of the neighborhood.
"The secret to a great hanging basket is starting with high-quality tubers and giving them the consistent moisture they need to thrive."
