Alphabetical Plant Listing

Aster azureus (Sky Blue Aster)

Skyblue Aster, Sky Blue American-Aster, Azure Aster, Blue Devils, Symphyotrichum oolentangiense


Aster azureus (Sky Blue Aster) is a rhizomatous perennial boasting a profusion of small daisy-like flowers, 1 in. wide (2.5 cm), with 10-20 deep blue to lavender rays surrounding yellow centers. Blooming in the fall, the airy blossoms are borne in elongated spreading clusters at the branch tips. The foliage of heart-shaped leaves, 4 in. long (10 cm), turns reddish in the fall. Sky Blue Aster makes a substantial statement in the late season garden. Native to North America, it is easy to grow, brings cheerful fall color and is a great source of nectar for butterflies. It looks great in meadows, prairies or naturalized areas and is an important component in a prairie restoration.

  • Grows up to 24-36 in. tall (60-90 cm) and 18-24 in. wide (45-60 cm). Will spread by rhizomes and self-seeding in the garden.
  • Thrives in full sun to light shade in average, dry to medium, well-drained soils. Provide good air circulation to avoid foliage diseases such as powdery mildew. Drought and dry soil tolerant.
  • Vital ingredient of fall borders, cottage gardens, rock gardens, prairies or butterfly gardens.
  • Cutting back after flowering will prevent undesired self-seeding.
  • No known serious pest or disease issues. Keep an eye out for powdery mildew.
  • Sow seeds outside in fall or provide cold stratification. Can also be propagated by softwood cuttings taken in late spring.
  • Native to eastern North America.

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Requirements

Hardiness 3 – 8
Plant Type Perennials
Plant Family Asters
Exposure Full Sun
Season of Interest Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 24" (60cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Showy
Native Plants United States
Tolerance Drought, Dry Soil, Rocky Soil
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

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Joshua Mayer, Flickr

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 8
Plant Type Perennials
Plant Family Asters
Exposure Full Sun
Season of Interest Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 24" (60cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Showy
Native Plants United States
Tolerance Drought, Dry Soil, Rocky Soil
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Asters

Guides with Asters

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