The Effects of Tree Shape and Form
The choice of a tree's shape and form can make a tremendous impact on the look and style of your garden; for example, narrow, upright trees such as red maple (Acer rubrum) can lend an air of formality over a garden, whilst wide-spreading or round headed trees, such as cherry (Prunus) or crab apple (Malus sylvestris) are seen to be informal and relaxed. Weeping trees such as willows (Salix) have a gentle and flowing profile, whilst cone- or pyramid-shaped trees (e.g Carpinus betulus - Hornbeam) produce a structured, sculptural effect.
When choosing a tree, always think about how long it will take to develop, and the different forms it may take during this period. Some trees may take decades before they fully mature and take on their final shape; a tree may form a structured, angled silhouette when young, then develop a graceful rounded crown after 20 or even 30 years.
Whilst combining trees with different shapes and forms can provide an interesting, contrasting effect, do take care; planting too many different styles can sometimes just look messy and uncoordinated. Remember also that your choice of tree shape and form will affect not only you, but any future occupiers of your house, and even neighbours, for many years to come.