Achillea ptarmica is a Hardy Perennial.

This is a "rhizomatous" plant, meaning it grows from underground stems. It forms a dense clump that slowly spreads outwards, creating excellent ground cover that suppresses weeds. Unlike the common yellow or red Yarrows (*Achillea millefolium*) which need dry soil, *ptarmica* is happy in moist, heavier soils.

The "Double" Bloom: The flowers are sterile, meaning they don't produce pollen. This allows the plant to hold onto its petals for weeks without fading, keeping the display looking fresh for longer.

This is an easy-to-grow perennial that often blooms in its first year if sown early.

Germination:
Sow indoors from February to April. Surface sow onto moist compost and do not cover (the seeds need light to germinate). Keep at approx 18-20°C. Germination takes 10-14 days.

Where to Sow:
Plant out after the last frost. It prefers full sun or partial shade. It is one of the few silver/grey-leaved plants that actually tolerates damp (but not waterlogged) soil.

Care While Growing:
Cut Back: After the first main flush of flowers in July, shear the whole plant back by half. This tidies up the foliage and encourages a second flush of blooms in September.

'Ballerina' provides the bright white highlights that make other colours pop:

• 💜 Verbena bonariensis: The Airy Partner. The tall, purple stems of Verbena float high above the low, white mounds of the Achillea. A classic, airy combination.
• 💗 Lychnis coronaria (Rose Campion): The Magenta Shock. The shocking magenta-pink of Lychnis against the pure white of 'Ballerina' creates a vibrant, high-energy cottage garden look.

Sow indoors Spring/Autumn. Flowers June to September.