Yarrow vs Smooth Aster - TreeTime.ca

Yarrow vs Smooth Aster

Achillea borealis (Previously Achillea millefolium)

Symphyotrichum laeve

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(new stock expected: fall of 2025)

NOT AVAILABLE THIS SEASON

(new stock expected: fall of 2025)

Yarrow
Smooth Aster

Yarrow is a herbaceous, native wildflower that is found across Canada. It features large, flat clusters of tiny white flowers. The blooms attract a variety of pollinators, making it an ideal choice for pollinator gardens. While partial shade is tolerated, the best flowering occurs in full sun. Yarrow is resistant to deer and rabbits, making it both a beautiful and practical addition to your landscape.

The entire plant is edible, but leaves and flowers are most commonly consumed. They have a strong licorice scent and a mild sweet flavor that is similar to tarragon. Yarrow leaves can also be used as a natural insect repellent.

It is important to plant Yarrow in the right place, it can spread quickly via both rhizomes and self-seeding. Deadheading the spent flowers will extend the bloom season and can help limit self-seeding.

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.

Yarrow Quick Facts

Smooth Aster Quick Facts

Zone: 3a
Zone: 3a
Height: 0.3 m (1.0 ft)
Height: 0.9 m (3 ft)
Spread: 0.9 m (3 ft)
Spread: 0.6 m (2.0 ft)
Moisture: dry, normal
Moisture: dry, normal
Light: partial shade, full sun
Light: partial shade, full sun
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no
Flowers: clusters of white flowers
Flowers: purplish-blue; daisy-like
Growth rate: fast
Growth rate: very fast
Life span: short
Life span: short
Suckering: none
Suckering: none



Toxicity: toxic to dogs, cats, and horses

Other Names: common yarrow, devils nettle, milfoil, western yarrow, white yarrow
Other Names: glaucous aster, smooth blue aster