Big-leaf Yarrow: complete guide

Overview

Big-leaf Yarrow (Achillea macrophylla) is a versatile, robust plant from Europe belonging to the Asteraceae family (Daisy family). Also known as Broad-leaved Yarrow, this plant is valuable in gardens for its long blooming season and minimal maintenance needs.

Appearance and growth

Big-leaf Yarrow grows in dense, low mounds of 16-24 inches tall. The leaves are green and broad (hence the name macrophylla), finely feathered and fragrant when touched. Flowers appear in July and August, grouped in flat clusters, typically white with subtle pink or yellow tints.

Ideal location

This plant thrives in a sunny location with at least 6-8 hours of direct sunlight daily. It also grows in partial shade, though full sun promotes optimal flowering. Ensure good air circulation to prevent fungal diseases.

Soil

Achillea macrophylla is not fussy about soil type. It grows in average, well-draining soil. Heavy clay can be improved with sand or compost. Overly rich soils may promote foliage over flowers.

Watering

Water regularly after planting, but once established, the plant is drought-tolerant. Water only when the top soil layer feels dry. Overwatering can encourage fungal issues. Good drainage is essential.

Pruning

Remove spent flowers regularly to encourage further blooming. After flowering, all stems can be cut to ground level. Compact plants benefit from light spring pinching.

Maintenance calendar

April: spring inspection. May-June: consistent watering. July-August: deadhead regularly. September: cut back growth. October-November: prepare for dormancy.

Winter hardiness

The plant is very hardy and can overwinter outdoors in temperate to cold climates. Excessive mulching can cause moisture-related issues; use sparingly.

Companion plants

Combine with other summer bloomers like Salvia, Lavender, and Allium. The broad leaves contrast nicely with finer foliage textures. Suits meadow planting schemes with grasses.

Conclusion

Big-leaf Yarrow is an indispensable plant for low-maintenance gardens. With minimal care, it offers long-lasting blooms and structure. Available at Intratuin and Gamma in the Netherlands, OBI and Hornbach in Germany.

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