Sirius has been awarded the Royal Horticultural Society's Award of Garden Merit for outstanding performance in the garden. Copious blossoms for many months from June to November, sometimes longer. Great for cutting & happy in borders & containers. Dead head by pulling the flowers stems gently from the bottom of the plant, the resulting "wound" then initiates new flowers. Prefers well-drained soil in a partly shaded sheltered site. Height 60cm (24"). Spread 45cm (18"). Fully hardy perennial.