PW® Firefly Diamond Yarrow (Achillea 'Firefly Diamond')

Firefly Diamond Yarrow (Achillea 'Firefly Diamond') is a clump-forming herbaceous perennial with delicate, aromatic, fern-like foliage. Flat clusters of long-lasting, clear white flowers rise on stiff stalks above the leaves in summer.

The flowers make excellent cut stems and retain their color when dried. Plant this heat- and drought-tolerant perennial in a sunny border or cutting garden, paired with rosemary or fountain grass for contrasting textures.

Growing details

• Plant type: Herbaceous perennial
• Mature size: 2–2.5 feet tall and 2.5–3.5 feet wide
• Spacing: Approximately 3 feet apart
• Hardiness: USDA zones 3–8
• Light: Full sun
• Soil: Well-drained soil
• Flowers: Clear white clusters in summer
• Foliage: Aromatic, fern-like leaves

Care and garden use

This low-maintenance perennial can develop floppy stems in rich, moist soil. Cut back in spring before flowering to reduce height, or after flowering to encourage additional blooms. Watch for occasional stem rot, rust, and powdery mildew.

Use in grouped plantings, borders, naturalized areas, wildlife gardens, rock gardens, water-wise landscapes, cutting gardens, or containers with good drainage.

Image credit: Proven Winners, 'Firefly Diamond' Yarrow. Plants naturally vary in appearance and may differ from the images shown.