A magnificent low45growing wide45spreading hardy annual producing a continuous display of snow white flowers all summer long always early to bloom alyssum 39carpet of snow39 has a ground hugging habit that is perfect for rock gardens or cascading from crevices in walls with a toughness that belies its delicate appearance sweet alyssum is surprisingly wind tolerant and makes a useful plant in coastal areas height 10cm 404amp343941 spread 25cm 4010amp3439