How to Take Cuttings from Dahlias for More Flowers

Table of Contents

1. Introduction
2. Why You Should Try Taking Dahlia Cuttings
3. What You’ll Need to Get Started
4. When is the Best Time to Take Cuttings?
5. Step 1: Waking Up Your Dahlia Tubers
6. Step 2: Selecting the Perfect Shoots
7. Step 3: Making the Cut
8. Step 4: Preparing and Planting the Cuttings
9. Essential Care for Rooting Success
10. Transplanting to Your Garden
11. Troubleshooting Common Issues
12. Growing Dahlias for Every Space
13. Realistic Expectations for Your Cuttings
14. Conclusion
15. FAQ

Introduction

There is a unique kind of magic in watching a favorite dahlia bloom for the first time in summer. Whether it is the massive, creamy petals of a dinnerplate variety or the perfectly geometric shape of a pompon, these flowers have a way of becoming the centerpiece of the garden. If you have ever found a variety you absolutely love, your first thought is likely: "I wish I had five more of these."

The good news is that you can easily multiply your collection without spending a fortune. Taking cuttings is one of the most rewarding ways to grow your garden, allowing you to turn a single tuber into a dozen beautiful plants. At Longfield Gardens, we believe that gardening should be accessible and enjoyable, and propagation is a simple skill that any home gardener can master with a little bit of patience.

In this guide, we will walk you through the entire process of taking dahlia cuttings, from waking up your tubers in early spring to planting your new rooted clones in the backyard. You will learn the best techniques for success, the tools you need, and how to care for these young plants as they grow. Taking dahlia cuttings is a practical and cost-effective way to fill your landscape with incredible color and professional-quality blooms. For a quick shopping shortcut, browse our dahlia collections.

Why You Should Try Taking Dahlia Cuttings

Most gardeners are familiar with planting dahlias in the spring, but taking cuttings offers several distinct advantages. The most obvious benefit is the ability to increase your stock for free. If you have purchased a premium or rare variety, taking cuttings allows you to "clone" that plant. Because the cuttings are genetically identical to the parent tuber, you know exactly what the flowers will look like.

Beyond the cost savings, plants grown from cuttings often exhibit impressive vigor. Because these plants start with a fresh root system and no "old wood" or potential rot from a previous year's tuber, they often grow quickly and produce high-quality blooms in their first season. By the end of the year, a plant grown from a cutting will even develop its own clump of tubers that you can dig up and store for the following year.

Taking cuttings also serves as an excellent "insurance policy." If you have a variety that is difficult to store over the winter, or if you are worried about a specific tuber not performing well, having several rooted cuttings ensures that you won't lose that variety from your collection. It is a productive way to spend the late winter and early spring months while you wait for the soil outside to warm up. For a broader overview of planting and care, see our All About Dahlias guide.

What You’ll Need to Get Started

You do not need an expensive laboratory or a commercial greenhouse to successfully root dahlias. Most of the supplies are items you likely already have in your garden shed or can easily find at a local garden center. Starting with clean, sterile materials is the most important part of the process to ensure your young plants stay healthy.

• Dahlia Tubers: Start with healthy, firm tubers that have visible "eyes" (the small bumps where growth begins). See Dahlia Tubers: What You Need to Know for a closer look.
• Potting Mix: Use a light, well-draining sterile potting soil or a professional seed-starting mix. Avoid heavy garden soil, which can pack down too tightly and suffocate new roots.
• Containers: Small plastic pots (about 3 to 4 inches) or deep seed trays work well. Ensure they have plenty of drainage holes.
• A Sharp Knife: A clean craft knife or a dedicated gardener’s knife is essential. A sharp blade makes a clean cut that heals quickly, whereas dull scissors can crush the delicate stem tissue.
• Rooting Hormone: While not strictly necessary, a rooting powder or gel can speed up the process and encourage a more robust root system.
• Heat Mat (Optional): Dahlias love warmth. A seedling heat mat provides "bottom heat," which signals to the plant that it is time to grow roots.
• Light Source: Because you will likely be starting these indoors in late winter, a shop light or a dedicated grow light is necessary to provide enough "daylight" for the cuttings.

What to do next: Gather your supplies in a clean workspace. Wipe down your knife with rubbing alcohol to ensure you aren't introducing any bacteria to the fresh cuts.

When is the Best Time to Take Cuttings?

Timing is everything when it comes to propagation. To have plants that are large enough to go into the garden once the frost has passed, you should start the process indoors about 8 to 10 weeks before your last expected frost date. For most gardeners in the United States, this means "waking up" your tubers in late February or March.

The goal is to give the cuttings enough time to develop a strong root system and a few inches of top growth before they face the elements outside. If you start too early, the plants may become "leggy" or root-bound in their pots. If you start too late, they may not have enough time to produce a significant tuber clump before the first frost of autumn. If you need help with timing, our Hardiness Zone Map can help.

Remember that dahlias are sensitive to cold. You should only plan to move your rooted cuttings outside once the soil temperature has reached at least 60°F and all danger of frost has passed. Following the local weather patterns in your area is more important than following a strict calendar date.

Step 1: Waking Up Your Dahlia Tubers

Before you can take a cutting, you need the tuber to produce shoots. This process is often called "jumping" or "waking up" the tubers. Place your tubers in a shallow tray filled with damp potting mix or vermiculite. You do not need to bury them deeply; in fact, leaving the "neck" of the tuber (where the eyes are located) exposed makes it much easier to see the new growth and make your cuts later.

Keep the tray in a warm spot, ideally between 65°F and 70°F. You do not need bright light at this stage, but once the first green nubs appear, move the tray under your grow lights. Keep the soil lightly damp but never soggy. Overwatering at this stage can cause the tuber to rot before it ever gets started.

Within 10 to 14 days, you should see small purple or green sprouts emerging from the eyes near the neck. These will eventually grow into the stems you will use for your cuttings. Be patient; some varieties wake up faster than others.

Step 2: Selecting the Perfect Shoots

Not every sprout is ready to be a cutting right away. You want to wait until the shoots are between 2 and 4 inches tall. At this size, the stem is firm enough to handle but still soft enough to root quickly. Ideally, the shoot should have at least two sets of leaves.

Look for vigorous, healthy growth. If a shoot looks pale or very thin, it might be better to let it grow a bit longer or wait for the next one. One of the great things about dahlias is that if you cut a shoot, the tuber will often produce two more in its place. This means you can continue to take cuttings from the same "mother" tuber for several weeks, significantly increasing your plant count.

Step 3: Making the Cut

There are two main ways to take a dahlia cutting: the basal cut and the stem cut. For the highest success rate, most experienced gardeners prefer the basal cutting.

To take a basal cutting, use your sharp knife to cut the shoot away from the tuber, taking a tiny "sliver" or "heel" of the tuber tissue with it. This woody base contains a high concentration of natural growth hormones, which helps the cutting root much faster. Be careful not to gouge a huge hole in the mother tuber; just a tiny piece of the outer "skin" at the base of the shoot is plenty.

If you cannot get a piece of the tuber, you can also take a stem cutting. In this case, you cut the shoot just above the point where it attaches to the tuber. While these still root well, they may take a few days longer than a basal cutting.

Regardless of the method, the most important rule is to use a clean, swift motion. Avoid sawing at the stem. A single clean slice is much easier for the plant to heal.

Step 4: Preparing and Planting the Cuttings

Once you have removed the shoot, you need to prepare it for its new home in the potting mix.

1. Trim the lower leaves: Carefully remove the bottom set of leaves from the stem. You want a clear "node" (the bump on the stem where the leaves were) because this is where the new roots will emerge.
2. Apply rooting hormone: Dip the bottom of the stem into your rooting hormone. If you are using a powder, tap off the excess. You only need a light coating.
3. Prepare the pot: Use a pencil or a small stick to poke a hole in your damp potting mix. This prevents the rooting hormone from being wiped off as you push the stem into the soil.
4. Insert and firm: Place the cutting into the hole, ensuring at least one leaf node is below the soil surface. Gently press the soil around the stem to ensure good contact.
5. Label immediately: It is incredibly easy to forget which variety is which. Always label your pots immediately with the variety name and the date you took the cutting.

Key Takeaway: Success with cuttings comes down to "node contact." Ensure the point where you removed the bottom leaves is tucked safely under the soil, as this is the primary site for root development.

Essential Care for Rooting Success

Once your cuttings are in their pots, they need specific environmental conditions to transform from a severed stem into a self-sustaining plant. This stage usually takes between 14 and 21 days.

Temperature and Heat Mats

Rooting happens much faster when the soil is warm. If your workspace is cool (like a basement or garage), a heat mat is a fantastic investment. Aim for a soil temperature around 70°F. Warm soil encourages cell division and root growth, while cold soil can lead to damping off, a common fungal issue where the stem rots at the soil line.

The 14-Hour Light Rule

Dahlias are photosensitive, which means they react to the length of the day. In the wild, shorter days signal the plant to stop growing leaves and start growing tubers for winter storage. If your cuttings think the days are short, they might try to grow a tiny tuber instead of roots. To prevent this, keep your grow lights on for 14 to 16 hours a day. This "long day" environment tells the plant to focus all its energy on producing feeder roots and lush green foliage.

Managing Humidity and Moisture

Because your cutting has no roots yet, it cannot pull water from the soil effectively. It relies on the moisture in the air to stay hydrated. You can create a "mini-greenhouse" by placing a clear plastic dome or a loosely fitted plastic bag over your pots.

Check your cuttings daily. If you see heavy droplets of water dripping down the sides of the dome, it might be too wet—simply vent the cover for an hour. If the soil feels dry to the touch, give it a light misting. The goal is "damp," like a wrung-out sponge, never "saturated."

Transplanting to Your Garden

You will know your cuttings are successful when you see new green leaves emerging from the top or when you see white roots beginning to poke through the drainage holes at the bottom of the pot. Before these "babies" can head out into the real world, they need to be "hardened off."

Hardening off is the process of gradually introducing indoor plants to outdoor conditions. Start by placing your pots in a shaded, protected spot outside for an hour or two each day, slowly increasing their time in the sun and wind over the course of a week.

When you are ready to plant, treat them just like you would a mature dahlia. Choose a spot with at least 6 to 8 hours of direct sunlight and well-draining soil. For the planting step itself, see our How to Plant Dahlias guide. Because these plants are smaller than those grown from large tubers, they may need a bit of extra protection from slugs or snails during their first few weeks in the ground.

Action Plan for Success:

• Wait for roots to fill the small starter pot before moving to the garden.
• Check the 10-day weather forecast to ensure no late-season frosts are looming.
• Apply a balanced, water-soluble fertilizer at half-strength once the plant is established in its new spot.

Troubleshooting Common Issues

Even for experienced gardeners, propagation can sometimes hit a snag. Most issues are related to water or temperature, and they are usually easy to fix.

If your cuttings are wilting, they are likely losing moisture faster than they can take it in. Increase the humidity by using a plastic dome and move them out of any direct, hot sunlight until they have roots.

If the stems are turning black at the base, this is usually "damping off." This happens when the soil is too wet or the air circulation is poor. To fix this, use a lighter potting mix, reduce your watering, and ensure your tools are sterilized before making cuts.

If the plant looks healthy but refuses to grow roots after three weeks, check your light and heat. Ensure they are getting at least 14 hours of light and that the soil is not sitting on a cold floor. Sometimes, a gentle "tug" on the stem will tell you if roots are starting to anchor; if there is resistance, you are on the right track.

Growing Dahlias for Every Space

One of the best things about multiplying your dahlias through cuttings is that it allows you to experiment with different garden designs. If you have extra plants, you can try growing some in large containers on your patio or creating a dedicated "cutting garden" specifically for making bouquets. For a ready-made dinnerplate mix, take a look at the Dahlia Dinnerplate Cloud Nine Collection.

Cuttings are especially useful for filling in gaps in your perennial borders. Since they start smaller than tubers, they are easy to tuck between other plants. By mid-summer, you won't even be able to tell the difference between a plant that started as a tuber and one that started as a 3-inch cutting. Both will be tall, vibrant, and covered in blooms. If you want more ideas for bouquets, see our How to Grow Dahlias for Cut Flowers guide.

We love seeing how home gardeners use these techniques to create beautiful spaces. Whether you are growing for the sheer joy of the color or to share bouquets with neighbors, taking cuttings makes it possible to have a lush, flower-filled yard on a budget. If you need support strategies, our How to Pinch and Stake Dahlias guide can help.

Realistic Expectations for Your Cuttings

While taking cuttings is highly successful, it is important to remember that nature has its own timeline. Every variety of dahlia behaves slightly differently. Some, like the famous Café au Lait, might take a bit longer to wake up and produce shoots. Others might root so quickly you will see growth in just ten days.

The weather also plays a significant role. A cloudy, cool spring might slow down the rooting process, while a bright, warm spring can speed it up. Do not be discouraged if a few cuttings do not make it—even professional growers expect a small percentage of loss. The beauty of this method is that since you are getting these plants for free from your existing tubers, there is very little risk and a very high reward.

By the end of the first season, your cutting-grown plant will produce flowers just like its parent. It will also grow a small cluster of tubers underground. While these tubers might be smaller than the ones from a multi-year-old plant, they are perfectly viable for storage and planting the following year.

Conclusion

Taking dahlia cuttings is one of the most satisfying skills a gardener can learn. It transforms a single purchase into a lifetime of flowers and allows you to share your favorite varieties with friends and family. By following the simple steps of waking up your tubers, making clean basal cuts, and providing plenty of light and warmth, you can successfully grow your dahlia collection this season.

At Longfield Gardens, we want to help you achieve the garden of your dreams. Our goal is to provide the high-quality tubers and the practical knowledge you need to succeed. Whether you are a beginner or a seasoned pro, propagation is a wonderful way to connect more deeply with your plants and enjoy the rewards of your hard work. If you want another ready-made option, browse the Dahlia Assorted Sangria Collection.

• Start early indoors to give cuttings time to mature.
• Use a sharp, sterile knife for clean cuts.
• Provide 14+ hours of light to encourage root growth.
• Hardening off is essential before planting outside.

Taking cuttings is like getting a bonus gift from your garden. With just a little bit of time and care, those small green shoots will become the stars of your summer landscape.

FAQ

Do I need to use rooting hormone for dahlia cuttings?

While dahlia cuttings will often root on their own in warm, moist soil, using a rooting hormone can significantly increase your success rate. It provides a concentrated boost of the hormones the plant needs to transition from growing a stem to growing roots. If you are a beginner, using a rooting gel or powder provides a helpful safety net.

Can I take cuttings from a dahlia plant already growing in the garden?

Yes, you can take cuttings from garden plants in early to mid-summer, but they may not have enough time to develop a tuber clump before winter. For the best results, it is usually better to take cuttings from tubers you have "jump-started" indoors in early spring. This gives the plant a full growing season to bloom and store energy for next year.

How do I know when my dahlia cutting has rooted?

The easiest way to tell is by looking for new growth. When the cutting starts producing new sets of leaves, it usually means it has developed enough roots to support itself. You can also give the stem a very gentle tug; if you feel resistance, the roots have begun to anchor into the soil. If you need a refresher on winter storage, see How to Overwinter Dahlia Tubers.

Will a plant from a cutting bloom in its first year?

Absolutely. One of the best parts about dahlia cuttings is that they are very vigorous. If they are started in early spring and planted out after the frost, they will typically reach full size and bloom at the same time as dahlias grown directly from tubers. They will even produce their own tubers that you can dig up and save in the fall.