Every garden needs a cool retreat for respite when the sun gets hot. A good garden design provides shade appropriate for different activities by designing the activities themselves, the house, trees and garden structures to create shade at the right place and time.
But that is just one part of the solution. The other is the kind and quality of shade you create. Different shading solutions give different results. The coolest shade remains the good old shade tree. Unlike artificial shades which trap hot air underneath, trees are designed by nature to allow hot air to escape. In fact, trees go further to actively cool the space beneath their canopy through the process of evapotranspiration.