Winter hardiness builds up gradually
In contrast to native flowering shrubs, the Asian butterfly shrub has to work harder to winter from year to year. Only as an established, well-rooted plant does your Buddleja davidii have a frost tolerance of up to - 20 degrees Celsius in the bed. In the year of planting and in the following 3 to 4 years, give your florifer a helping hand with the following precautions:
- Leave the fallen leaves in the autumn
- With more leaves and brushwood, create a protective layer of 10 to 20 cm on the root disc
- Water a little in dry winter weather
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Since the shoots are cut in late winter anyway, further measures are not necessary at this point. If belated ground frosts announce themselves after budding in spring, keep the young twigs with a cover made of fleece Frost damage.
Winter protection in the bucket is essential every year
In contrast to its conspecifics in the bed, a butterfly bush in the bucket depends on the following precautions every year in order to survive the cold season unscathed. How to do it right:
- Before the onset of winter, move the bucket under a canopy or in front of a house wall
- Place the vessel on a wooden block and wrap it with bubble wrap
- Cover the substrate with autumn leaves, wood wool or straw
In winter-gray regions, ideally place the pot in a sturdy wooden box, the bottom of which is covered with bark mulch. Fill in the spaces between the wooden wall and the bucket as well Mulch.(€ 239.00 at Amazon *) Furthermore, the root disc is given a layer of leaves as winter protection. During the winter time, water the butterfly bush from time to time so that the root ball does not dry out.
Tips
The limitation of winter hardiness to a base value of - 20 degrees Celsius does not affect the seeds. If a butterfly bush is given the opportunity to distribute its seeds in the bed, the seeds survive even freezing frost. To prevent the invasive spread of the Neophytes to prevent, therefore cut the withered flowers early in late summer.