Aster alpinus L.
Alpine Aster, Blue Alpine Daisy, Rock Aster, Wild Aster
Aster alpinus subsp. alpinus, Aster alpinus var. alpinus, Aster breyninus, Aster chrysocomoides, Aster cylleneus, Aster fallax, Aster garibaldii, Aster hirsutus, Aster hispanicus, Aster korshinskyi, Aster nivalis, Aster pulchellus, Aster scabris, Aster wolfii
Color: pink, violet-lavender, dark purple-black, or white-near white
Bloom Time: Late spring or early summer
Aster alpinus is a herbaceous perennial that forms a clump, up to 12 inches (30 cm) tall, with narrow, dark green leaves and daisy-like flower heads that are up to 2 inches (5 cm) in diameter. The bloom color may be pink, violet-lavender, dark purple-black, or white-near white and may bloom in late spring or early summer or, occasionally, midsummer.
USDA hardiness zone 3a to 8b: from −40 °F (−40 °C) to 20 °F (−6.7 °C).
How to Grow and Care
Divide mature plants in spring, just as the new shoots begin to grow. This should be done every few years to avoid crowding of plants.
As with many other flowering plants, deadhead (cut back spent flowers) to make room for newer blossoms. This will extend the health and flowering of your plants. Be sure to deadhead early on in the blooming season. Blooming will be reduced if done too late. This will also restrain unwanted reseeding, which will cause plant overcrowding.
Remember, Asters are prone to mildew, so be careful to plant them in areas with good circulation and good sun exposure.
As with other flowering plants, do not allow water to saturate leaves. Be sure to water at the plant's roots to prevent mildew and mold. Drip irrigation and utilization of a soaker hose work very well in watering these plants. See more at How to Grow and Care for Aster.
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