Growing potted dahlias can be a great way to enjoy these beautiful flowers, even if you live in a climate that is not ideally suited for them. However, whether or not potted dahlias will come back every year depends on a few factors.
Firstly, it’s important to understand that dahlias are native to Mexico and Central America, where they thrive in warm climates. In these regions, they are considered perennial plants, meaning that they can come back year after year. However, in colder climates, dahlias are typically grown as tender perennials or even annuals, as they may not survive the winter.
If you live in a colder climate, you will need to take some extra care to ensure that your potted dahlias have the best chance of returning each year. Here are some tips to help increase their chances of survival:
1. Choose the right varieties: Some dahlia varieties are hardier than others and have a better chance of surviving the winter. Look for varieties that are labeled as being suitable for your climate zone. Smaller flowered varieties often tend to be hardier than larger, more delicate ones.
2. Prepare the pots for winter: Before the first frost, it’s important to prepare your potted dahlias for winter. Remove any dead or dying foliage and cut back the stems to a few inches above the soil level. This will help prevent disease and rot during the dormant period.
3. Protect the tubers: In colder climates, dahlias are typically grown from tubers, which are swollen underground stems. After cutting back the foliage, carefully lift the tubers from the pot and gently shake off any excess soil. Inspect the tubers for any signs of damage or disease, and discard any that are not healthy. Allow the tubers to dry out for a few days before storing them for the winter.
4. Store the tubers properly: To ensure the tubers survive the winter, they need to be stored in a cool, dry place. You can use a cardboard box or a paper bag filled with sawdust or vermiculite to store the tubers. Place them in a location where the temperature remains consistently between 40-50°F (4-10°C). Check on the tubers periodically during the winter to make sure they are not drying out or rotting.
5. Replant in spring: In the spring, once the danger of frost has passed, you can replant your stored tubers in fresh pots or directly in the garden. Choose a sunny location with well-draining soil. Plant the tubers with the “eyes” facing up, about 4-6 inches deep. Water the plants regularly and provide support for the stems as they grow.
By following these steps, you can increase the likelihood of your potted dahlias coming back year after year. However, it’s important to note that there are no guarantees, especially in colder climates. Factors such as extreme cold temperatures, excessive moisture, or disease can still affect the survival of your dahlias.
Personally, I have had success with overwintering potted dahlias in my garden. I live in a zone where winters can be quite cold, so I take extra precautions to ensure the tubers survive. I have found that selecting hardier varieties, properly preparing and storing the tubers, and providing a suitable growing environment in the spring has greatly increased my chances of seeing my potted dahlias return each year. However, I do recognize that there is always some element of unpredictability when it comes to gardening, and not every plant will survive every winter.
