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- Hardiness:
USDA zone 2
.
- Water use: Low.
- Light: Perform best in full sun but can tolerate light
shade.
- Size: 6 inches to 4 feet tall, depending on species.
- Plant habit: Upright and spreading or mat-forming,
depending on the species. Herbaceous perennial; semi-evergreen or
deciduous, depending on species and severity of winter.
- Season of bloom: Late spring to late summer.
- Culture: Grows in ordinary, well-drained soils; doesn't
require much fertilization.
- Maintenance: A. millefolium spreads rapidly
and the stems tend to become tall and floppy. Pruning the plant early
in the season will help produce a more compact plant. Dividing the plant
on a regular basis (every two years or so) also will help keep the plants
to a manageable size. Plants may rebloom if pruned back after flowering.
- Pests/Diseases: Insect- and disease-free. Stem
rot may be a problem during the winter and early spring in very heavy, wet
soils.
- Other: Some species reseed. Grows wild in Washington and Idaho.
- Species and cultivars: We have had success with these
species and cultivars:
- Achillea millefolium: Flowers in a wide range of colors,
including white, red, pink, orange, and salmon.
- Achillea x 'Moonshine': Silvery-gray foliage and bright, lemon
yellow flowers. Shorter than Achillea millefolium; about 2' tall.
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