Willows are a wide ranging genus of trees and shrubs with some becoming noble tall trees, whilst others remain prostrate alpines. They have an ability to grow in many temperate environments, including waterlogged ground. Some are grown for their colourful stems, others for showy catkins, both at their best in winter through spring. Shrubs can be coppiced or pollarded every couple of years, around March time. Salix have alternate leaves and buds, whilst the similar Cornus have opposite leaves and buds.