1 litre sized pot. Centaurea cineraria has silver fern-like foliage and gold-yellow flowers that appear in summer but flowers are often removed to help encourage the more eye-catching leaves. It likes well-drained soil in a sunny position and is tolerant of heat and drought once established. Flowers reach up to 80cm tall with foliage reaching approximately 45cm tall. Also known as Dusty Millar or Silver Dust.