Landscape Tips for August – September: Thunderstorms and hurricanes are possible. Adjust irrigation systems and schedules based on rainfall frequency. Lawns that are too wet can result in fungus, mushrooms and dollar weed indicate excess moisture. Lawns should be mowed in 5-7 day intervals. Prune heads of trees and shrubs so that high winds can pass through and not damage limbs. Lawn pests are most prevalent during this time.