It is a large genus with over 1000 species and most have showy flower displays. It includes the plants known to gardeners as azaleas. It's the national flower of Nepal. Both species and hybrid rhododendrons (including azaleas) are used extensively as ornamental plants in landscaping in many parts of the world, and many species and cultivars are grown commercially for the nursery trade. Rhododendrons are often valued in landscaping for their structure, size, flowers, and the fact that many of them are evergreen. Azaleas are frequently used around foundations and occasionally as hedges, and many larger-leafed rhododendrons lend themselves well to more informal plantings and woodland gardens, or as specimen plants. In some areas larger rhododendrons can be pruned to encourage more tree-like form eventually growing to 10-15 m or more tall.