Step-by-Step Growing Guide
Yarrow (Achillea millefolium) is one of the most adaptable perennials in cultivation. It thrives in lean, well-draining soil with a pH of 6.0–7.0 — rich, fertile soil actually reduces flowering and promotes floppy growth. Sandy or gravelly loam is ideal. Plant in full sun with spacing of 45–60 cm between plants. Sow seeds shallowly (barely cover) as they need light to germinate, or divide established clumps in spring or autumn. Water newly planted specimens regularly until established (6–8 weeks), then reduce to rainfall supplementation only — established yarrow is exceptionally drought-tolerant. Do not fertilise; excess nitrogen causes lush, floppy growth and fewer flowers. Deadhead spent flower clusters to prolong bloom from early summer into autumn. Divide clumps every 2–3 years in early spring when the centre begins to die out.