Dahlias, unfortunately, are not winter hardy. This means that when temperatures drop, the leaves and remaining blooms of dahlias will collapse and be damaged. It can be disheartening to see your beautiful dahlias wilt and wither, but all hope is not lost. Despite their vulnerability to frost, dahlias have a survival mechanism in the form of their tubers that grow beneath the ground.
These tubers are the key to ensuring the longevity of your dahlias. While the plant above ground may suffer during winter, the tubers remain unharmed and can survive to bloom again in the following year. However, they do require a little care and attention from you to ensure their well-being.
Here are some steps you can take to protect your dahlia tubers during winter:
1. Digging up the tubers: Before the first frost hits, it is recommended to dig up the tubers from the ground. This should be done carefully to avoid damaging the tubers. Use a garden fork or spade to gently lift the tubers out of the soil, being cautious not to break or bruise them.
2. Cleaning and drying: Once the tubers are out of the ground, gently remove any excess soil clinging to them. Avoid washing them with water, as this can lead to rot. Instead, allow the tubers to dry naturally in a well-ventilated area for a few days. This helps prevent the growth of mold or fungus.
3. Trimming and labeling: After the tubers have dried, inspect them for any signs of damage or disease. If you notice any soft or discolored areas, carefully trim them off with a clean, sharp knife. It is also a good idea to label each tuber with the variety name or any other relevant information. This will help you keep track of your dahlias during storage.
4. Storage options: There are a few different ways to store dahlia tubers over winter, depending on your available space and resources. Here are some popular methods:
– Peat moss or vermiculite: Place the tubers in a container, such as a cardboard box or plastic bag, and cover them with slightly damp peat moss or vermiculite. Make sure the tubers are not touching each other and that the container is well-ventilated. Store them in a cool, dry place, such as a basement or garage, where the temperature remains above freezing.
– Sawdust or sand: Another option is to layer the tubers in a box or crate filled with sawdust or sand. Again, ensure that the tubers do not touch each other and that the container is well-ventilated. Store in a cool, dry location.
– Pots or containers: If you have limited space, you can also store the tubers in pots or containers filled with a well-draining potting mix. Place the tubers in the containers, cover them with a layer of soil, and store them in a cool, frost-free area. Make sure to check the moisture levels periodically, as they should be kept slightly moist but not overly wet.
5. Checking on the tubers: Throughout the winter months, it’s a good idea to periodically check on your stored tubers. Inspect them for any signs of rot or decay, and remove any affected tubers immediately to prevent the spread of disease. If the tubers appear to be drying out, you can lightly mist them with water to maintain some moisture.
6. Preparing for spring: As winter comes to an end and the threat of frost has passed, it’s time to prepare your dahlia tubers for planting again. About a month before the last expected frost, begin the process of “waking up” your tubers. This involves placing them in a shallow tray or container and introducing some moisture to encourage sprouting. Keep them in a warm, well-lit area to allow the shoots to develop.
7. Planting in spring: Once your dahlia tubers have developed healthy shoots, they are ready to be planted in the ground again. Choose a sunny location with well-draining soil and prepare the planting area by loosening the soil and adding compost or organic matter. Plant the tubers at a depth of around 4-6 inches, ensuring that the shoots are facing upward. Water thoroughly after planting and continue to provide regular care throughout the growing season.
By following these steps, you can ensure the survival and future blooming of your dahlias year after year. While they may not be winter hardy, with a little care and attention, you can enjoy the beauty of dahlias in your garden season after season.
