Summer aster - not hardy and therefore re-sow annually

Summer aster - not hardy and therefore re-sow annually

Summer asters are not hardy

In contrast to the well-known autumn asters, summer asters are not winter hardy. If you are very strict, summer asters are not even asters. These plants are only closely related to asters. They also call themselves Callistephus chinensis.

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An annual crop

The summer aster from China consumes all of its strength within a year. It grows in spring to bloom in summer and well into autumn. She does not build up energy reserves. It only trains its seeds. These can be used for propagation in the next year.

For this reason, the summer asters are not perennial plants like the autumn asters. They are annual plants. They need to be replanted or sown every year.

The plant dies after flowering

Regardless of how much you have cherished and cared for your summer aster, in autumn the plant will perish irrevocably. This means:

  • it no longer needs fertilizer
  • there is no need to cut back
  • it doesn't need winter protection
  • it is torn from the ground and disposed of

Re-sow after winter

In principle, sowing summer asters is uncomplicated. The germination time is short, as is the effort and the germination rate of the seeds is high. Therefore: If you want to see summer asters in your garden again next year, you should sow them again in spring.

Please note:

  • do not sow outdoors before mid-May
  • like to prefer home from March
  • Cover seeds lightly with soil and press down
  • Keep the substrate moderately moist
  • Germination temperature 10 to 20 ° C
  • Germination time: 2 to 4 weeks
  • prick out later


Summer asters should not be planted in the same place every year. Since these plants tend to get sick from the aster wilt, it is advisable to change location every year.