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Noble yarrow

Achillea nobilis · Asteraceae

The gardener's calendar

The right move for September

Ideal time to plant noble yarrow: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous, very fine and feathery
Flowering
June to September, golden yellow flowers
Mature size
30-50 cm in height, 40-60 cm in spread
Growth
Fast
Hardiness
Very hardy, down to -20 °C
Origin
Central and Mediterranean Europe
Soil type
Well-drained, poor to moderately fertile

Care

Exposure

Yarrow thrives in full sun for optimal flowering and vigorous development. It tolerates a few hours of light shade, but flowers better with at least 6 hours of direct daily sunlight. A well-ventilated location limits health issues.

Soil and drainage

This plant prefers well-drained, poor to moderately fertile soil. Improve compacted soil with sand or gravel to prevent water retention. Overly rich soil promotes vegetation at the expense of flowering.

Watering

Water regularly after planting and during the first season to establish the root system. Once established, yarrow is very drought-resistant. In summer, limit watering to prolonged dry periods; avoid excess moisture.

Pruning and deadheading

Regularly remove faded flowers to extend flowering. In late autumn or early spring, cut the clump back to ground level (5-10 cm) to rejuvenate the plant and encourage good branching. This pruning also facilitates leaf renewal.

Fertilizing

Yarrow is undemanding and requires only very moderate fertilizing. An application of well-rotted compost in late winter is sufficient. Avoid nitrogen-rich fertilizers that weaken the structure and reduce flowering.

Diseases and pests

This species is generally healthy and disease-resistant. Excess moisture can cause rot or powdery mildew. Ensure good air circulation and excellent drainage. Pests are rare; careful watering is the best prevention.

Did you know?

The name 'Yarrow' comes from Achilles, a hero in Greek mythology, who allegedly used it to heal his soldiers' wounds. This medieval reputation persisted in Europe, where yarrow was reputed to promote wound healing and relieve minor inflammation. Its essential oil remains appreciated in traditional herbalism for its aromatic properties.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.