Yarrow 'The Pearl' (Achillea ptarmica)

Where to Plant:

Achillea ptarmica thrives in full sun but can tolerate partial shade. It requires well-drained soil and will not do well in waterlogged conditions, especially during wet winters. If your soil is heavy clay, consider amending it with grit or sand to improve drainage, or plant in raised beds or containers. It's an excellent choice for garden borders, rockeries, cottage gardens, and wildflower meadows. Its elegant sprays of white, pom-pom-like flowers are attractive to bees and butterflies.

How to Plant:

Plant Achillea ptarmica in spring (after the last frost) or late summer/early autumn. If planting from seed, sow seeds on the soil surface, as they require light to germinate; do not cover them. If planting pot-grown plants, dig a hole deep enough to accommodate the root system. Place the plant so the crown is at soil level, backfill with soil, and firm gently. Space plants 30-45cm apart to allow for good air circulation, which helps prevent powdery mildew. Water well after planting to settle the soil.

Aftercare:

Achillea ptarmica is low-maintenance once established. Water regularly during its establishment phase and during prolonged dry periods, but avoid overwatering. It's fairly drought-tolerant once mature. Fertilize minimally, perhaps once a year in spring, as excessive nutrients can lead to leggy growth and reduced blooming. Deadhead spent flowers to encourage continuous blooming from June to August. In exposed positions, you may need to stake taller varieties before flowering. Cut back the plant to the ground in late winter, but resist the urge to do this earlier, as the dried seed heads provide food for birds and offer winter interest. Lift and divide large clumps in late autumn or early spring every few years to rejuvenate the plant and manage its spread, as it can slowly form colonies by rhizomes. Watch for aphids and powdery mildew, ensuring good airflow to mitigate the latter.