Centranthus ruber

A long-flowering perennial that thrives in poor, dry soils and coastal conditions. Its clusters of deep pink to crimson blooms appear from spring into autumn, bringing vibrant colour and relaxed, informal charm.

Red valerian self-sows aggressively across the Mediterranean — it has naturalised on rocky walls and roadside banks from Greece to Portugal — and produces dense rounded heads of small star-shaped flowers in deep raspberry-red, pale pink or pure white. In the Mediterranean it flowers from late April through July and reblooms in autumn if cut back hard after the first flush. The blue-grey lance-shaped leaves are evergreen in mild winters. Hardy to -10°C, it tolerates poor alkaline soils, drought, salt and direct sun on stone surfaces, and is genuinely deer- and rabbit-resistant.

Centranthus reaches 60–90 cm tall and as wide, with a slightly sprawling habit that suits informal compositions. It is most at home in the cracks of dry stone walls, on stepped slopes, in gravel paths and meadow plantings — anywhere conditions are too harsh for fussier perennials. The raspberry-red form glows against silver Stachys byzantina, blue Salvia 'Caradonna' and the chalky greys of Lavandula angustifolia. Combine with Erigeron karvinskianus, Verbena bonariensis and Stipa tenuissima for a romantic, slightly wild Mediterranean composition that hums with bees and butterflies. Cut back hard in mid-summer to prevent excessive self-seeding and to trigger autumn reblooming.