The Fascinating World of Yarrow: A Guide to the Achillea Genus
From the battlefields of Greek mythology to the modern-day garden, the plant known as yarrow has left a lasting impression on human history. Belonging to the genus Achillea, these flowering plants are celebrated for their beauty and their storied past. Legend has it that the soldiers of the Greek hero Achilles used the plant to treat wounds, a connection that survives today in common names like "allheal" and "bloodwort."
Physical Characteristics and Appearance
Yarrow plants are easily recognized by their distinctive foliage and floral displays. They typically feature frilly, hairy, and aromatic leaves. The scent is a hallmark of the genus, making them a sensory delight in any landscape. One of the most striking features is the inflorescence—the arrangement of flowers on a plant—which consists of large, flat clusters of small flowers located at the top of the stem.
Silvery Yarrow ( Achillea clavenae )
These flower clusters come in a vibrant array of colors, including white, yellow, orange, pink, and red. Because of their open structure, they support a generalized pollination system, meaning they are visited by a wide variety of insects, making them a vital resource for local pollinators.
Macro image of Yarrow in Sweden
Taxonomy and Scientific Classification
The genus Achillea was formally described by the renowned botanist Carl Linnaeus in 1753. While the name "yarrow" is most commonly used to refer to the species Achillea millefolium, it can also apply to many other species within the genus. The genus belongs to the Asteraceae family, which is the same family as sunflowers and daisies.
| Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Order | Asterales |
| Family | Asteraceae |
| Subfamily | Asteroideae |
| Tribe | Anthemideae |
| Genus | Achillea |
Ecology and Natural Distribution
Yarrow is a resilient genus primarily native to Eurasia and North America. It thrives in various temperate environments, playing a significant role in local ecosystems. Beyond attracting pollinators, yarrow species serve as essential food plants for the larvae of certain Lepidoptera (the scientific order that includes butterflies and moths).
Yarrow inflorescence at seed maturity
Yarrow inflorescence after seed fall
Species Diversity and Garden Cultivars
The diversity within the Achillea genus is immense, with nearly 1,000 published names at or below the species level. While scientists continue to debate the exact status of various subspecies and varieties, the genus remains incredibly varied. Some notable species include Achillea alpina (Siberian yarrow) and Achillea millefolium (common yarrow).
Because of their hardiness and beauty, many yarrow cultivars are highly prized by gardeners. Several have even received the Royal Horticultural Society (RHS) Award of Garden Merit, a distinction given to plants of exceptional quality. Popular cultivars include 'Moonshine', 'Summerwine', and 'Gold Plate'.
Natural growing of Achilleas
Key Facts
- Mythological Origin: Named after the Greek hero Achilles, whose soldiers reportedly used it for wound care.
- Common Names: Also known as allheal and bloodwort.
- Native Regions: Primarily found in North America, Europe, and temperate Asia.
- Pollination: Features a generalized pollination system that attracts many different insects.
- Ecological Role: Acts as a food source for butterfly and moth larvae (Lepidoptera).
- Garden Popularity: Widely used in landscaping, with many cultivars holding RHS awards.
Frequently Asked Questions
Why is the yarrow plant named after Achilles?
The genus was named in honor of the Greek mythological character Achilles. According to legend, his soldiers used the plant to treat their wounds during battle.
What colors can I expect to see on yarrow flowers?
Yarrow flowers appear in a variety of colors, including white, yellow, orange, pink, and red, often arranged in large, flat clusters.
Where does yarrow grow naturally?
The genus is primarily native to the temperate regions of North America and Eurasia.
Are yarrow plants useful for wildlife?
Yes, they are excellent for biodiversity. They attract many different types of pollinating insects and serve as food plants for the larvae of various butterflies and moths.
What is common yarrow?
Common yarrow refers specifically to the species Achillea millefolium, though the term is sometimes used more broadly to describe other plants in the genus.