Smooth Aster vs Prairie Crocus - TreeTime.ca

Smooth Aster vs Prairie Crocus

Symphyotrichum laeve

Pulsatilla nuttalliana (Anemone patens)

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Smooth Aster
Prairie Crocus

Smooth Aster is a native perennial wildflower known for its violet-blue, daisy-like flowers. They bloom later in the season, from late summer to early fall. The flowers attract a variety of pollinators, including bees, butterflies, and other beneficial insects. It also serves as a host plant for the Silvery Checkerspot (Chlosyne nycteis) and Pearl Crescent (Phyciodes tharos) butterflies, further enhancing its ecological value. This easy-to-grow wildflower is well suited for native wildflower gardens, pollinator gardens, and naturalization projects.

The Smooth Aster’s non-aggressive root system allows it to spread slowly, and it is more likely to reproduce by seed, which can be controlled through deadheading. As a perennial, it dies back to the crown each winter, it will regrow from the base in the spring. Avoid disturbing the crown during late winter to ensure healthy growth the following season.

Prairie Crocus is a native perennial wildflower that is often considered one of the first signs of spring. The flowers can range from purple, pale blue, to white and often appear before the snow has fully melted. It can bloom a month earlier than other spring flowers, providing an early source of pollen for a variety of pollinators.

The plant is covered in woolly white hairs, including the finely divided leaves, giving them a silvery appearance. Prairie Crocus leaves do not fully emerge until after it has bloomed. The spent blooms transform into fluffy, feathery seed heads. During the hot summer months, the Prairie Crocus goes dormant and will repeat its life cycle the following spring.

The Prairie Crocus is Manitoba’s provincial flower.

As a perennial, it dies back to the crown each winter, it will regrow from the base in the spring. Avoid disturbing the crown during late winter to ensure healthy growth the following season.

Smooth Aster Quick Facts

Prairie Crocus Quick Facts

Zone: 3a
Zone: 1b
Height: 0.9 m (3 ft)
Height: 0.2 m (0.5 ft)
Spread: 0.6 m (2.0 ft)
Spread: 0.2 m (0.5 ft)
Light: partial shade, full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: very fast
Growth rate: fast
Life span: short
Life span: short
Growth form: low growing, clump-forming
Spreading: seeds - medium, rhizomes - low
Suckering: none


Toxicity: all parts toxic if eaten, sap can irritate skin
Foliage: fuzzy, finely divided leaves
Flowers: purplish-blue; daisy-like
Flowers: pale purple, cup-shaped
Bloom time: late summer to early fall
Bloom time: early spring
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Other Names: glaucous aster, smooth blue aster
Other Names: american pasqueflower, crocus anemone, pasqueflower, prairie pasqueflower, prairie smoke