Oceans of Camassia leichtlinii subsp. suksdorfii at Marks Hall Arboretum, Essex and at RHS Wisley Garden, Surrey. This clump-forming bulbous perennial has long, linear leaves and star-shaped blue flowers in late spring. It will grow in moist but well-drained, fertile soil and will tolerate winter flooding. It can be naturalised in lawns or used in borders.