Your choice of a gazebo, pergola or arbour will depend upon the space you have and the degree of shade you require. Broadly speaking a pergola provides partial shelter and shade over a garden, pathway or patio. Often a pergola has a criss-crossed wooden roof and can provide growing space for climbing plants and vines. Meanwhile, a gazebo is a covered structure usually designated as a seating area or perhaps hot tub cover, as it offers more protection from the elements. Arbours although often coming with built in seating tend to be smaller and open to the elements and have a strong decorative function.