Rose campion is a garden plant with soft, silvery leaves and stems and magenta, pink, or white flowers in summer. The name dusty-miller is also used for unrelated silver-leaved plants.
Lamb's ear makes a low, spreading mat of broad, very soft leaves and sends up narrow spikes of small purple-pink flowers. Rose campion grows upright and has separate, broad five-petaled flowers above narrower silvery leaves.
Why they get mixed upBoth are common garden plants with woolly silver foliage.