Achillea Walther Funcke (3 × 2 litre pots)

Bright, terracotta flowers with flat heads. Position: full sun Soil: moderately fertile, well-drained soil Rate of Growth: average Flowering period: June to September Hardiness: fully hardy The orange-red flowers of this yarrow are tiny, but they form in generous flattened heads, which are useful for adding horizontal interest in the planting scheme. Fading to creamy yellow as they age, they are held high throughout the summer on upright stems, which emerge from a loose clump of ferny foliage. Long-flowering and drought tolerant once established, 'Walther Funcke' works well in borders with a hot colour scheme, but it also makes a great contrast for blues and purples. Like all Achillea, it is highly attractive to bees and other beneficial insects. Garden care: Achillea prefer well-drained soil and can suffer during very wet winters. To protect plants that are susceptible to rot in wet winter conditions, ensure they are planted in well-draining soil and consider adding grit or sand to the surrounding planting area to improve drainage. Raise beds or plant in containers if necessary, and avoid spots where water collects. If wet conditions are unavoidable, consider using a cloche or cold frame to shield the plants from excessive moisture. In exposed positions stake using bamboo canes or brushwood before the flowers appear. Cut down to the ground in late winter, but resist the urge to do this earlier, as the seed heads offer a food source for birds and are attractive in low winter light. Lift and divide large clumps in late autumn or early spring.