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Growing Dahlias in Containers: A Comprehensive Guide for Beginners

by Gregory
3 minutes read

Growing Dahlias in Containers: A Complete Guide for Beginners

Dahlias are beautiful, full-blooming flowers that are native to Mexico. They can be grown in virtually any climate during the summer months. Planting dahlias in containers is a great option for people who have limited space for a traditional garden. Even if you have a garden, container-grown dahlias can add a splash of color to your patio or front porch.

Can Dahlias Be Grown in Containers?

Yes, dahlias can be grown in containers. However, it requires a bit more care and attention than growing them in the ground. If you’re looking for a plant that you can simply plant and forget about, dahlias may not be the best choice.

Choosing a Container

When choosing a container for your dahlias, it’s important to select one that is large enough in diameter to accommodate the tuber. The tuber should be able to fit comfortably in the bottom of the container when laid horizontally.

The container should also have plenty of drainage holes. If it only has one or two holes, consider drilling a few more. This will help to prevent the tuber from rotting.

Planting Your Dahlia

  1. Moisten a loose potting mix that contains good draining elements like perlite and bark. Fill the container about a third of the way up.
  2. Lay your dahlia tuber flat in the container with the eye or sprout, if there is one, facing upwards.
  3. Add more potting mix until the tuber is just barely covered and the eye is just sticking out.
  4. Water the dahlia well.

Caring for Your Dahlia

Support: Dahlias are tall plants that require support as they grow. Next to the tuber, sink a strong pole up to 5 feet (1 m.) in length to the bottom of the pot. Drill two holes into the side of the pot opposite the pole, and anchor it in place with a piece of wire or string.

Sunlight: Dahlias need full sun to bloom properly. Place your container in a spot that receives at least 6 hours of sunlight per day.

Water: Dahlias need regular watering, especially during the hot summer months. Water your dahlia when the top inch of soil feels dry to the touch.

Fertilizer: Dahlias are heavy feeders and require regular fertilization. Fertilize your dahlia every few weeks with a balanced fertilizer.

Pruning: Dahlias will bloom more profusely if you deadhead the spent flowers. Deadheading simply means removing the faded flowers from the plant.


Pests: Dahlias are susceptible to a few pests, including aphids, spider mites, and thrips. These pests can be controlled with insecticidal soap or neem oil.

Diseases: Dahlias can also be affected by a few diseases, including powdery mildew, botrytis, and verticillium wilt. These diseases can be prevented by providing your dahlia with good air circulation and avoiding overwatering.


Growing dahlias in containers is a rewarding experience. With a little care and attention, you can enjoy these beautiful flowers all summer long.

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