Rose campion is a short-lived perennial — technically biennial in behaviour — that earns its keep through the electric magenta-pink of its flowers against some of the most striking silver-white woolly foliage in the garden. The felt-like leaves form a rosette visible from late March, well before most perennials stir, and the branching flower stems rise to 2–3 feet by early June.
It self-seeds prolifically and this is how it persists in the garden — individual plants may live only 2–3 years, but seedlings appear reliably around the parent. Deadhead to prevent excess spread, or let it roam freely in a naturalistic planting. The white-flowered form 'Alba' is striking against the silver foliage; 'Oculata' has pale pink petals with a deep rose eye. Tolerates neglect, poor soil, and dry conditions better than most — conditions that richer perennials would refuse.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.