With the onset of the cold season, the Kolkwitzia begins to hibernate. Container plants can overwinter both indoors and in the garden.
The Kolkwitzia (Kolkwitzia amabilis), often referred to as the mother-of-pearl shrub, is one of the fully hardy plants outdoors. When cultivating in a bucket, however, you must protect the Kolkwitzia with a few simple measures.
Hold on to the following tips and nothing will stand in the way of a good start to next spring.
Overwinter Kolkwitzie in the house
In September, the Kolkwitzia prepares for the winter rest period. Do not prune or fertilize the plant after this time. In October, bring the Kolkwitzie to a cool, frost-free room. Unheated conservatories, bright staircases, garages or even basements and attics with large windows are ideal locations. Temperatures of 8°C to 10°C are ideal. Slightly lower temperatures are tolerated without any problems.
Check the Kolkwitzia meticulously for pests at the beginning of the hibernation and do not choose a damp location where mold has already formed. Water the plant every two weeks with a little water. From April you can bring the Kolkwitzia back into the garden.
Wintering Kolkwitzie in the garden
If you want to overwinter your Kolkwitzia in a tub outside, you must ensure that the root ball does not freeze completely. Choose a sheltered spot, preferably on the south side of the house. Place the bucket on a piece of Styrofoam at least four centimeters thick or on thick wooden boards. The styrofoam or wood acts as an insulating layer and prevents ground frost from rising in the bucket.
Wrap the bucket with a double layer of coconut mats. Alternatively, bast or straw mats are also suitable. Tie down the mats with a strong cord. As an alternative to the mats, you can also use significantly cheaper bubble wrap. However, the plastic does not look as charming as the mats made of natural materials. Finally, cover the bucketa layer of pine sticks. You should use frost-free days in winter to water the Kolkwitze. Limit yourself to small amounts of water.
Protect Kolkwitzie against frost in spring
If the Kolkwitzia sprout very early in spring or if there is a risk of frost again during spring, you should protect the shoots with jute bags. Also, do not place the plant in full sun right away. The young leaves are quite sensitive and often react to too much sun with sunburn. It is better to get the plant used to the sun slowly.