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PlantFiles: Western Yarrow
Achillea millefolium var. occidentalis

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Achillea (ak-ih-LEE-a) (Info)
Species: millefolium var. occidentalis

Synonym:Achillea angutissima
Synonym:Achillea gracilis
Synonym:Achillea millefolium var. rosea
Synonym:Achillea occidentalis
Synonym:Achillea rosea

One vendor has this plant for sale.

Category:
Perennials

Height:
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

Spacing:
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

Hardiness:
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
N/A

Bloom Color:
Pink
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Blooms repeatedly

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Non-patented

Propagation Methods:
By dividing the rootball

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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By Xenomorf
Thumbnail #1 of Achillea millefolium var. occidentalis by Xenomorf

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Thumbnail #4 of Achillea millefolium var. occidentalis by Xenomorf

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Thumbnail #6 of Achillea millefolium var. occidentalis by Xenomorf

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Thumbnail #7 of Achillea millefolium var. occidentalis by Xenomorf

There are a total of 8 photos.
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Profile:

1 positive
No neutrals
1 negative

Gardeners' Notes:

RatingAuthorContent
Negative Clary On May 28, 2013, Clary from Lewisburg, PA (Zone 6b) wrote:

Obtained a few plants from a Texan gardener through ebay and planted in my midAtlantic garden last September.

The leaves were green and growing all through winter. By March the plants had tripled in size. This spring they grew 3+ feet tall and still hadn't formed flower heads yet.... Monsters in the making.

Today I dug them out and took at least 3 gallons of soil with them. Roots were a spreading dense mat that had swallowed three neighboring plants. I got them out not a day too soon.

Unless you want to cover an entire hillside, I don't recommend this plant for wet rich soils.

Positive frostweed On Aug 31, 2006, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:

Achillea millefolium var. occidentalis is Native to Texas and other States.

Regional...

This plant has been said to grow in the following regions:

Flagstaff, Arizona (2 reports)
Prescott Valley, Arizona



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