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Are asters really hardy? | Asters in the garden and pot

  • Are asters hardy "> Asters hibernate
    • Outdoors
    • bucket attitude

Asters are among the most popular garden and tub plants for their many color variations, and from May to late November they adorn their flowers with terraces, flower beds and balconies. Many owner of the daisy family wonder if the plants are hardy and if they need winter protection, especially specimens that are kept in the pot. Asters will surprise you with their winter hardiness.

You are thrilled with your asters, but ask just before winter, whether they will endure the winter? The umbelliferae, which sometimes look a bit like daisies, are known for their robust nature. Even during the cold season, the plants stand upright and do not pass away, while their withered flowers and shoots blend in with the winter landscape . This makes them such popular plants as they delight the gardener throughout the year. Nevertheless, it is necessary to know when it can get too cold for them and what measures are necessary to bring them through the winter.

Are asters hardy?

Asters are among the extremely hardy plants and can withstand even very cold winters without being damaged. Even potted plants can be easily kept outside without entering, as long as there is sufficient winter protection for the tub. The plant itself does not need to be protected. The winter hardiness of the asters is indicated by the respective winter hardiness zone. The following hardiness zones are typical of the species that you can purchase and plant in Central Europe.

Asters in the garden bed
  • Z6: - 23.3 ° C to -17.8 ° C
  • Z5: - 28.8 ° C to - 23.4 ° C
  • Z3: -40.0 ° C to -34.5 ° C
  • Z2: - 45.5 ° C to -40.1 ° C

Based on the winter hardiness zone, you can see which of your asters are particularly hardy and which need a bit more winter protection. Of course, the Z stands for Zone, while the number behind it indicates which zone is being used. As you probably know, the higher numbered zones are warmer. Since there are only a few asters in this zone, you can safely overwinter your plants in the garden.

Here is an overview:

  • Wildaster (bot. Aster ageratoides): Z6
  • Bergaster (offered by Aster amellus): Z5
  • Cushionaster (bot. Aster dumosus): Z3
  • Alpenaster (offered: Aster alpinus): Z3
  • Sommeraster (bot. Callistephus chinensis): Z3
  • Waldaster (bot. Eurybia divaricata): Z3
  • Myrtenteraster (bot., Symphyotrichum ericoides): Z3
  • Raublattaster (bot. Symphyotrichum novae-angliae): Z2
  • Smooth leaflet (bot., Symphyotrichum novi-belgii): Z2
Summer aster, Callistephus chinensis

These data refer exclusively to the asters of the genus Aster (bot. Aster), autumn butterflies (bot., Symphyotrichum) and Eurybia, which were formerly all brought together to form the aster and not other genera within the order of the aster-like (bot. such as the chrysanthemums (bot. chrysanthemum). These keep the winter with a good winter protection also in the bed, but only slightly in the bucket, as it freezes faster and therefore requires even more effective protection.

Tip: If you live in regions with mild winters, you will not need winter protection in most cases. Above all, the west Baden-Württemberg, the southern Rhineland and the Palatinate should be mentioned here.

Winter asters

The wintering of asters is not really difficult. Although you can easily tolerate cool temperatures, but they should not have to survive the winter without complete preparation. Especially when kept in the bucket, it must be provided with a winter protection, so that the substrate does not freeze and dry out, which greatly adds to the asters. Even planted in the bed specimens are happy about a winter shelter, which provides them with enough nutrients, so they can drive out in the spring. Asters planted in the bed prepare for the winter in the following way.


Step 1: Do not cut the asters before winter, until spring. The shoots and flowers act as an independent winter protection, which should remain at the Aster. You can cut off blooms and withered blooms if you keep a flowering aster in summer or spring. The flowers could rot in too high humidity.

Summer aster, Callistephus chinensis

Step 2: Before the first frost shows, distribute a mixture of compost and soil around the root ball. A layer of brushwood is spread over it.

More is not needed for the asters planted in the bed.

bucket attitude

For bucket attitude, on the other hand, proceed as follows:

Step 1: Find a new location for the pot. This should be as follows.

  • cool
  • bright
  • not in closed rooms
  • protected from the weather

Especially well south facing southeast facing house walls, as they get enough light.

Step 2: It is best to pack the bucket to prevent it from freezing. For this you use one of these two options.

  • Winter Protection Fleece
  • Jutesack

3rd step: Afterwards you should not forget to water the asters during the whole winter. Since they should not get rainwater, this task must be done by you, because drying out causes damage to the root system.

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