Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Achillea L. [101]

genus_ja:

genus_en: Yarrow

# spp.:

pub_year:

accepted: Accepted

Family: Asteraceae

family_ja: キク

Infra familial classification:

distribution_en:

description_en: Genus of about 85 species of mainly deciduous perennials from temperate regions of the N. hemisphere. Some, from mountainous regions, are low growing and mat-forming; other species, from grassland or dry wasteground, are taller and herbaceous. The grey or green, often aromatic leaves are mostly 1- to 3-pinnate or pinnatifid, and fern-like, although some are entire, they are elliptic to lance-shaped, toothed, and 15-30cm (6-12in) long in most species, 5-12cm (2-5in) long in smaller-growing achilleas. The basal leaves are usually larger than the stem leaves. Most achilleas produce daisy-like flowerheads, 3-15mm (1/8-1/2in) across, in corymbs, 7-12cm (3-5in) across, In summer and autumn; the disc- and ray-florets are usually both white or both yellow. Newer cultivars and hybrids, including the Galaxy Hybrids (A. millefolium x A. ’Taygetea’), offer a wide colour range, and produce flowerheads in compound corymbs, 15-20cm (6-8in) across. Grow achilleas in a wildflower or rock garden; the taller ones are excellent for a mixed or herbaceous border, and for cutting and drying. Contact with foliage may aggravate skin allergies.

hardiness_en: Fully hardy.

cultivation_en:

propagation_en: Sow seed in situ or divide in spring. A. clypeolata is short-lived, so divide annually to maintain stocks. Divide A. ’Moonshine’ regularly to maintain vigour.

pests_en: Aphids may be a problem; powdery mildew is common, especially on A. ptarmica cultivars.

description_ja:

comment: N.temp.

comment_ja: ノコギリソウ，ヤロー(yarrow)

type_species:

Phylogenetic definition:

Update Information: Created: 2007-12-06 12:51; Updated: 2020-09-04 03:56

family: