Buttonbush vs Smooth Aster - TreeTime.ca

Buttonbush vs Smooth Aster

Cephalanthus occidentalis

Symphyotrichum laeve

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Buttonbush
Smooth Aster

Buttonbush is a moisture loving shrub that provides year round interest.

It has round, fragrant flowers resembling small buttons or pincushions. The flowers transform into small reddish-brown fruit that persists into winter while the leaves take on shades of red in fall.

Providing essential food to bees, butterflies, and other insects, this shrub is versatile. Try it in your next shrub border.

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.

Buttonbush Quick Facts

Smooth Aster Quick Facts

Zone: 4a
Zone: 3a
Height: 2.4 m (8 ft)
Height: 0.9 m (3 ft)
Spread: 1.5 m (5 ft)
Spread: 0.6 m (2.0 ft)
Moisture: normal, wet
Moisture: dry, normal
Light: any
Light: partial shade, full sun
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no
Flowers: large, white, spherical
Flowers: purplish-blue; daisy-like
Growth rate: medium
Growth rate: very fast
Life span: long
Life span: short
Maintenance: medium
Suckering: low
Suckering: none




Other Names: glaucous aster, smooth blue aster