Introduction
There is something truly magical about the moment a pom pom dahlia reveals its first bloom. These flowers are nature’s geometric masterpieces, featuring perfectly spherical heads and petals that curve inward with mathematical precision. Whether you are a seasoned grower or a beginner planting your very first tuber, the reward of harvesting these tidy, colorful globes is a highlight of the summer gardening season.
We at Longfield Gardens love pom pom dahlias for their reliability and their incredible performance in bouquets. While their intricate appearance might make them look like they require expert skills, they are actually quite accessible for any home gardener. Success comes down to understanding a few simple preferences regarding sun, soil, and the right amount of "pinching" to encourage a massive harvest of blooms.
This guide will walk you through everything you need to know to grow these stunning varieties in your own backyard. From choosing the perfect site to mastering the art of the cut, we are here to help you enjoy a season filled with these delightful, globe-shaped wonders. Growing dahlias is a rewarding journey, and pom pom varieties are among the most satisfying plants to welcome into your garden.
Understanding the Pom Pom Form
Before you dig your first hole, it is helpful to understand exactly what makes a pom pom dahlia unique. In the world of dahlias, classification is based on the shape and size of the bloom. Pom pom dahlias (often spelled "pompon") are defined by their small, spherical shape. To be a true pom pom, the flower must be a perfect globe, usually measuring two inches or less in diameter.
The petals, or florets, are "revolute," which means they roll inward to form a tube-like shape. This structure gives the flower its dense, honeycomb appearance. You may also encounter "ball" dahlias, which look very similar. The main difference is size; ball dahlias are larger, typically ranging from two to four inches, and they often have a slightly flattened top.
Pom pom dahlias are prized by floral designers because their sturdy, honeycomb structure makes them incredibly durable. They don't bruise as easily as the large, thin-petaled dinnerplate varieties, and they hold their shape beautifully in a vase. Because the plants tend to produce a high volume of flowers on strong stems, they are perfect for anyone who wants a "cut-and-come-again" garden.
Choosing the Right Planting Site
The foundation of a healthy dahlia is the environment in which it grows. Like most summer-blooming bulbs and tubers, pom pom dahlias have specific needs that, when met, make the rest of the growing season much easier.
Sun Exposure
Pom pom dahlias are sun-worshippers. To produce those intricate, dense blooms, they need at least six to eight hours of direct sunlight every day. Full sun keeps the stems strong and prevents the plants from becoming "leggy"—a term gardeners use when plants stretch toward the light, resulting in weak, floppy stems. If you live in an exceptionally hot climate, a little bit of dappled afternoon shade can help prevent the colors from fading, but for most US gardeners, the sunniest spot in the yard is the best choice.
Soil and Drainage
The term "drainage" simply refers to how quickly water moves through the soil. Dahlias have fleshy tubers that can rot if they sit in cold, soggy earth. You want soil that is rich in organic matter but loose enough for water to flow away.
If you have heavy clay soil, you can improve it by mixing in some compost or well-rotted manure before planting. If you are planting in a low-lying area where puddles linger after a rain, consider using a raised bed. This ensures the tubers stay high and dry during the early spring rains.
Airflow
Because pom pom dahlias grow into bushy, dense plants, they need good air circulation. Avoid planting them too close to solid fences or in tight corners where the air stays still. Good airflow helps keep the foliage dry, which naturally prevents common issues like powdery mildew.
Key Takeaway: For the best results, match your dahlias to a spot that offers "full sun and free-flowing water." If the site stays sunny and the soil doesn't stay soggy, you are already halfway to success.
Timing and Soil Temperature
One of the most common mistakes in dahlia growing is planting too early. Because we ship our tubers from Longfield Gardens based on your USDA hardiness zone, they will arrive at roughly the right time for your area. However, the weather can be unpredictable.
Dahlias are native to Mexico and Central America, so they love warmth. They are extremely sensitive to frost. You should wait to plant your tubers until all danger of frost has passed and the soil has warmed up to about 60°F. If the soil is too cold and wet, the tuber will sit dormant and may struggle.
A good rule of thumb is to plant your dahlias at the same time you would plant your tomatoes or peppers. If it is warm enough for those summer vegetables, it is warm enough for your dahlias.
How to Plant Pom Pom Dahlia Tubers
Once the soil is warm and the site is ready, it is time to get the tubers in the ground. Follow these steps for a healthy start:
- Dig the Hole: Dig a hole about 4 to 6 inches deep.
- Add Support Early: If you are growing a variety that reaches three feet or taller, it is a great idea to drive a stake into the ground right now. Placing the stake at planting time prevents you from accidentally driving it through the tuber later in the season.
- Position the Tuber: Lay the tuber horizontally in the hole. Look for the "eye"—this is the small bump or sprout where the new growth will emerge. The eye should be facing upward toward the sky.
- Cover with Soil: Fill the hole back in with soil. Do not pack it down too tightly; a gentle firming of the soil is all that is needed.
- Spacing: Space your pom pom dahlias about 12 to 18 inches apart. While they look small now, they will grow into substantial bushes by mid-summer and will need plenty of room to breathe.
A Note on Early Watering
Here is a "simple gardening rule" that surprises many beginners: Do not water your dahlias immediately after planting.
Unless your soil is bone-dry, there is usually enough moisture in the earth to wake the tuber up. Watering too much before the plant has sprouted can lead to rot. Wait until you see the first green shoots peeking through the soil before you start a regular watering routine.
Essential Summer Care
As your dahlias grow, they will need a little bit of ongoing attention to reach their full potential.
Watering Correctly
Once the plants are established and growing vigorously, they are thirsty. They prefer deep, infrequent watering over light daily sprinkles. This encourages the roots to grow deep into the soil. Aim for about an inch of water per week, either from rain or irrigation. If you have sandy soil, you may need to water more often, as sandy soil loses moisture quickly.
Fertilizing for Blooms
Dahlias are heavy feeders, but you have to be careful with the type of nutrients you provide. Avoid high-nitrogen fertilizers (the first number on the package). Nitrogen encourages a lot of green leaves but very few flowers. Instead, look for a fertilizer that is higher in phosphorus and potassium (the second and third numbers), which supports root development and bloom production. Applying a balanced organic fertilizer once a month during the growing season is usually plenty.
Managing Pests the Easy Way
The most common visitors to young dahlia plants are slugs and snails, who find the tender new shoots delicious. The best approach is to be proactive. You can use a pet-safe iron phosphate bait around the base of the plants as soon as they sprout. This simple step protects the growing tip, which is the most important part of the plant in the early weeks.
What to do next:
- Monitor the soil temperature until it hits 60°F.
- Lay tubers horizontally with the "eye" facing up.
- Hold off on watering until you see green sprouts.
- Apply a slug deterrent early to protect new growth.
The Secret to More Blooms: Pinching
If you want your pom pom dahlias to be covered in flowers rather than just having one or two stems, you must "pinch" them. This is the single most important step for a high-yield garden.
Pinching is a form of pruning that encourages the plant to branch out. When the plant is about 8 to 12 inches tall and has four sets of leaves, use a clean pair of snips or your fingers to remove the very top of the center stem.
It might feel a bit scary to cut off the top of a healthy growing plant, but don't worry! By removing that central "apical bud," you are telling the plant to send its energy to the side buds. Instead of one tall, lanky stem, you will get a bushy plant with multiple branches, each of which will produce its own pom pom flowers.
Staking and Support
Pom pom dahlias generally grow to be about 3 to 4 feet tall. Because they produce so many flowers, the plants can become top-heavy, especially after a heavy rain. Providing support ensures your beautiful blooms don't end up face-down in the mud.
The Single Stake Method
If you placed a stake at planting time, simply use soft garden twine or strips of old fabric to loosely tie the main stem to the stake as it grows. Add a new tie every 12 inches.
The Tomato Cage Method
For a low-maintenance approach, a sturdy tomato cage can work wonders. Place the cage over the tuber shortly after planting. As the dahlia grows, the branches will naturally rest on the wires of the cage. This is an easy way to keep the plant contained and upright without much effort.
The "Hedge" Method
If you are growing a long row of dahlias for cutting, some gardeners use the "corralling" technique. Drive heavy stakes at the corners of the bed and every few feet along the sides. Run several levels of twine around the perimeter of the stakes to create a "box" that holds the entire row of plants upright.
Varieties of Pom Pom Dahlias to Explore
Part of the fun of growing these flowers is choosing from the many colors available. At Longfield Gardens, we select varieties that are known for their strong stems and consistent bloom shapes. Here are a few classics to look for:
- Franz Kafka: A legendary variety that produces perfectly formed, bright pink pom poms. It is a prolific bloomer and a favorite for mixed bouquets.
- Aurora's Kiss: For those who love deep, moody colors, this variety offers miniature ball-shaped blooms in a rich, dark red.
- Jomanda: This variety brings a warm, autumnal feel to the garden with its burnt orange and terracotta tones.
- Cornel: A classic red ball dahlia that is slightly larger than a standard pom pom but shares that same beautiful, symmetrical globe shape.
- Moor Place: This is a showstopper for those who want dark, velvety purple-maroon flowers. It is frequently seen in competitive flower shows because its form is so precise.
Harvesting and Floral Care
Pom pom dahlias are the stars of the vase. Unlike many other flowers, dahlias will not open much after they are cut. This means you need to wait for the perfect moment to harvest.
When to Cut
Pick your pom pom dahlias when they are nearly or fully open. Look at the back of the flower head; the petals should be firm and not starting to wilt or turn brown. If the petals on the back are starting to look "papery" or are falling off, the bloom is past its prime.
Best Time of Day
The best time to harvest is early in the morning when the plants are fully hydrated from the cool night air. Use clean, sharp pruners and cut the stems long—even if it means cutting off a few side buds. This encourages the plant to produce even more long-stemmed flowers.
Post-Harvest Tips
Immediately place the cut stems into a bucket of clean, room-temperature water. To help the flowers last as long as possible, change the water in your vase every two days. Keeping the water fresh prevents bacteria from clogging the stems, allowing the flowers to stay hydrated and vibrant for five to seven days.
Key Takeaway: Always cut your dahlias when they are fully open. They don't have the energy to open up once they are separated from the plant, so what you see at the moment of cutting is what you will have in the vase.
End-of-Season Care
Pom pom dahlias will bloom and bloom until the first hard frost. Once the foliage has been turned black by the frost, the growing season is over.
In warmer climates (Zones 8-11), you can often leave the tubers in the ground, provided the soil doesn't stay too wet during the winter. In colder climates (Zones 7 and below), you will need to dig up and store the tubers if you want to save them for next year.
- Cut Back: Cut the stalks down to about 4 inches above the ground.
- Dig Gently: Use a garden fork to lift the tuber clumps carefully, being sure not to snap the "necks" of the tubers.
- Clean and Dry: Brush off the excess soil and let them dry in a shaded, frost-free spot for a day or two.
- Store: Store the tubers in a breathable container (like a cardboard box) filled with peat moss, vermiculite, or wood shavings. Keep them in a cool, dark place that stays between 40°F and 50°F.
While digging and storing is an extra step, it is also an exciting opportunity. Over the summer, that single tuber you planted will have multiplied into a clump of several tubers. By dividing them in the spring, you can turn one plant into three or four for the next season!
Troubleshooting Common Issues
If your pom pom dahlias aren't performing as expected, it is usually due to one of a few simple factors.
Few Flowers, Lots of Leaves
This is almost always caused by too much nitrogen fertilizer. Switch to a bloom-boosting fertilizer or simply stop fertilizing and let the soil balance out. It can also happen if the plants are not getting enough sun.
Weak, Floppy Stems
This is usually a result of "shady" conditions. If the plant has to stretch for light, the stems won't have the strength to hold up the heavy globe flowers. Make sure your plants get at least six hours of sun.
Yellowing Leaves
If the bottom leaves are turning yellow, check your soil moisture. If the soil is very wet, the roots might be struggling for air. If the soil is very dry, the plant might be thirsty. Adjust your watering to ensure the soil stays consistently moist but not saturated.
Conclusion
Growing pom pom dahlias is a journey that rewards patience and a bit of sunshine. These plants are prolific, sturdy, and undeniably beautiful, making them a must-have for anyone who loves fresh-cut flowers. By focusing on the basics—warm soil, plenty of sun, and the crucial step of pinching—you can enjoy a spectacular display of geometric blooms from mid-summer right through the first frost of autumn.
We hope this guide makes you feel confident and excited to start your own dahlia patch. Remember, every gardener learns by doing, and dahlias are very forgiving plants. Whether you are growing Franz Kafka for its pink perfection or Moor Place for its deep purple drama, the joy of the harvest is waiting for you.
- Wait for the warmth: Plant when the soil is 60°F.
- Pinch for success: Snip the tops when the plant is 10 inches tall.
- Cut when open: Harvest flowers when they are fully formed.
At Longfield Gardens, we are here to help you grow a more beautiful world, one tuber at a time. If you have questions about your order or need advice on which variety is right for your space, our team is always ready to support your gardening goals.
"Pom pom dahlias are the perfect blend of nature's beauty and mathematical order. They bring a sense of tidy elegance to the garden that few other flowers can match."
FAQ
When do pom pom dahlias start blooming?
Most pom pom dahlias will start to bloom about 8 to 12 weeks after planting. Depending on your local weather and when you got them into the ground, you can usually expect to see your first flowers in July or August, and they will continue blooming until the first frost of autumn.
Can I grow pom pom dahlias in containers?
Yes, you can! Because pom pom varieties are often more compact than the giant dinnerplate types, they do well in large pots. Ensure the container is at least 12 to 15 inches deep and has excellent drainage holes. You will need to water container-grown dahlias more frequently than those in the ground. For more guidance, see growing dahlias in containers.
Do I need to deadhead pom pom dahlias?
Absolutely. Deadheading dahlias—the practice of removing faded flowers—is essential for keeping the plant productive. If you leave the old flowers on the plant, it will stop producing new buds and focus its energy on making seeds. By cutting off old blooms, you signal the plant to keep making more flowers.
Why are my pom pom flowers looking small or flat?
The very first blooms of the season can sometimes be a bit smaller or less "perfectly round" than those that come later. As the plant matures and the weather settles into a consistent summer rhythm, the bloom quality and shape usually improve. Ensure the plant is getting enough water and consistent sunlight to help it form those dense, spherical heads.
