Steps to take to insure good air circulation are do not crowd – over planting in a area will not give a fuller look, plant according to given instructions on spacing. It may look a little open and bare at first but with time the plant/s will fill the area. Choose carefully when planting under low branching trees and shrubs, while some trees and shrubs can be enhanced by pruning off low branches, others will look like they were hacked. When planting a new plant make sure any low dense overgrowth from other plants is cut back, also check the finished height of the plant to insure it will be able to reach its full height with no interference.
Proper air movement will allow plants to dry quicker after a light or heavy rainfall and permits the sun to filter through to help in the drying process, keeping your plants healthy.