Minimize early maturing grasses to reduce the potential for rapid surface fires. Mow and rake grasses during the growing season. Remove or 
thin shrubs. A good rule of thumb is to keep space between plants at least five times their height. Prune shrubs to maintain an open structure and prevent dense branching.
Prune tree branches to 10 feet or more above the ground to reduce the possibility of surface fires spreading into tree crowns. Thin trees to maintain at least 10 feet between the crowns. Remove understory trees or space widely.
Look for these characteristics in fire retardant plants: open branches, high moisture content in leaves, drought tolerant, little or no seasonal accumulation of dead vegetation, and slow growing (requires less pruning).
Preparing Your Home for Wildfire Season