Tanacetum cinerariifolium (Pyrethrum) 9 cm Pot

Growth habit & appearance: Tanacetum cinerariifolium forms neat mounds of soft, finely divided, silver-green foliage with a slightly aromatic quality typical of the Asteraceae. In summer it sends up branching stems topped with bright white daisies and golden centres, creating a vivid contrast against the pale leaves. These flowers are highly attractive to pollinating insects, offering a valuable nectar resource while also contributing a clean, ornamental structure to herb gardens.

Growing conditions: A fully hardy perennial well adapted to Irish conditions, Pyrethrum thrives in full sun and prefers free-draining soil. It tolerates poorer substrates and coastal winds, making it a resilient addition to Irish gardens. Once established, it remains long-lived and dependable. 

Traditional & herbal uses: This species is the primary botanical source of pyrethrum, a powerful natural insecticide extracted from the dried flower heads. Historically used externally and agriculturally, it has never been used internally due to its toxicity. Ecologically, despite its insecticidal compounds, the fresh flowers remain attractive to pollinators, supporting beneficial species while providing a natural alternative to synthetic pesticides.

Maintenance & harvesting: Pyrethrum requires minimal care: keep soil well drained, deadhead spent blooms to extend flowering, and cut back stems after the season ends. Flowers are traditionally harvested at full bloom for their pyrethrum content. Allow seed heads to dry fully if saving seed. As a toxic plant, handle with care and avoid ingestion.