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Care Instructions for Asters


  • Soil requirements: Loamy, well-drained soil. Some varieties prefer acid soil.
  • Bloom time: Late summer to fall.
  • Zones: 3-9

Asters are well-loved for their attractive blue, purple, pink, or white blooms. These small, button-shaped flowers may be confused for fringe daisies, but they appear later in the year: usually late summer or early fall. Because of the late bloom time, asters are fantastic fillers for areas that lack color after the summer.

Soil Prparation:

Asters should be planted in loamy, well-drained soil. Soil acidity preferences vary, so check your plants’ packaging for more information.


These are true sun perennials, and should be planted in sunny beds or borders. Plant potted asters 1-3 feet apart, depending on the expected size of the Aster variety. Mix in a small amount of organic fertilizer at planting, and water in well.

Continuing Care:
After planting, deep watering is required throughout the growing season. If your plants receive less than one inch of rain per week, water weekly. However, continued light watering, or watering of the leaves and flowers, may cause problems such as stem rot for these thin-stalked plants.
Asters grow quickly, and taller varieties may need to be staked. Add a thin layer of compost, plus a two-inch layer of mulch, over the soil every spring. Cut back the foliage in early summer to encourage growth. Asters grow and multiply quickly, so plan to divide them once every two to three years. Divide them in early spring.