Centranthus ruber 'Snowcloud' HP/BB
This a super white-flowered variety of the wildflower Red Valerian. A jolly addition to the mid-summer garden – will self seed between paving stones and in the tops of walls. It is a bushy plant with large, branched flowerheads bearing clusters of tiny fragrant flowers, very attractive to butterflies. Ht 1-3ft. Best in well-drained poor soil in sun.