Birch Leaf Spirea vs Smooth Aster - TreeTime.ca

Birch Leaf Spirea vs Smooth Aster

Spiraea betulifolia

Symphyotrichum laeve

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NOT AVAILABLE THIS SEASON

(new stock expected: fall of 2026)

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Smooth Aster

Birch Leaf Meadowsweet is a small, rounded shrub, reaching 3 to 4 feet high.

In the early summer, white flowers emerge with dark green foliage. Come fall, birch-like leaves turn a kaleidoscope of red, orange, and purple adding seasonal interest.

Native to Japan and Eastern Asia, this dwarf shrub attracts butterflies and is an excellent option for the front row of a 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.

Birch Leaf Spirea Quick Facts

Smooth Aster Quick Facts

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




Other Names: birch leaf meadowsweet, shiny leaf spirea, white spirea
Other Names: glaucous aster, smooth blue aster