Dahlias are very sensitive to frost. In winter they need to be protected from freezing temperatures. Ideally, the tubers are dug up and stored indoors. In sheltered locations and very mild winters, wintering outside can also be successful.
Can you let dahlias overwinter outside in winter?
To overwinter dahlias outside in winter, cut down the georgines, layer a thick layer of soil and leaves and secure them with bubble wrap. Make sure you have a protected location and protection from moisture and voles. However, the chances of success are uncertain.
Winterizing dahlias outside
- Cut down Georgians
- Lay up a thick layer of soil and leaves
- Secure with bubble wrap (€14.00 on Amazon)
The problem is that you don't know in advance whether the winter will be very cold. Trying to overwinter dahlias outside is only worthwhile if the planting site is in a protected place.
Wetness can also be fatal to the tubers. If the winter is very humid, the moisture cannot escape through the thick cover. This causes the roots to rot.
Tips & Tricks
In addition to frost and too much moisture, voles are a danger to dahlia bulbs that overwinter outside. They eat up the tubers, so you wait in vain for new shoots next spring.
