Early each spring the new foliage emerges bright red, hence the name. The showy new foliage is followed by long-lasting chains of white flowers. 'Mountain Fire' has the North American species P. floribunda in its lineage, which lends it greater hardiness, so that it can be grown further north. Requires good drainage in humus-rich acidic soil. lily-of-the-valley shrub has almost unlimited uses in the landscape. They are often used in plantings of rhododendrons, azaleas, and camellias. However, the plants are very showy in shrub borders or when used as foundation shrubs around the home.