Suddenly and completely unexpectedly the temperatures drop below freezing. Panic sets in because the dahlias are outside in the bed. Is their end near now because they have been hit by frost?
Is it a concern if dahlias get frost?
If dahliasshort-termget frost, it isnot a concern The above-ground parts of the plant do die. However, the underground dahlia tuber survives. It can be dug up and overwintered. Dahlias that freeze in spring can sprout again.
Are dahlias frost tolerant?
Dahliasdo not tolerate frost. They freeze to death at temperatures below freezing. That's why we don't consider them hardy.
Why do dahlias not tolerate frost?
Dahlias are originally fromMexicoand arenotadapted to low temperatures. They need a warm climate to stay he althy and grow.
How does frost damage manifest itself on dahlias?
In autumn, frost damage to dahlias is usually noticeable throughbrown flowers and drooping leaves. This means that the above-ground parts of the plant are frozen. The dahlia tubers only freeze when there is severe frost lasting several days.
When are dahlias vulnerable to frost?
Dahlias are at risk of frost both inautumnand inspring. If they are planted outdoors too early in spring and there are night frosts, the fresh shoots will freeze and the dahlia will no longer sprout. To minimize the risk of frost damage in spring, it is recommended to advance dahlias and not plant them out until mid-May. Frostbite is quite normal in autumn.
What to do if the dahlias get frost in autumn?
If the above-ground parts of the dahlia have frozen in the fall, it is time to dig up thetubers First, cut the dahlia to 10 cm above the ground. Then lift the tubers out of the ground with a digging fork. If necessary, they can be shared. They are then overwintered. A cool but frost-free place is important for overwintering the tubers. Wrap the tubers in newspaper and place them in a wooden box, for example.
How can a dahlia be protected from frost when it is budding?
When the dahlia sprouts and frost is forecast, it can be protected withinsulating materials. Styrofoam, cardboard or a pot are suitable, for example.
Tip
Let the tubers dry before storing
Let the dahlia tubers air dry for one to two days before storing them for overwintering. Otherwise they can rot.
