Leucanthemum x Superbum (Shatsa Daisies). A cottage garden favorite the Shasta Dairy with its trademark white flowers with pretty yellow centers that cover the bush for long periods is a tough garden plant. Leucanthemum x Superbum are an excellent plant for dry and difficult positions, they require little care and can easily be prunned to maintain shape and size. Leucanthemum x Superbum tend to 'self layer' however thay are not invasive.Cultivars such as 'becky' and 'forest white' are available. Nurseries, Mail Order Nurseries, Specialist Nurseries,Retail Nurseries, Wholesale Nurseries, Garden Centers, Plant Nurseries.