No vegetation except for 3-inch grass or succulents around the perimeter of your home. Vines and ivy will have to be well-irrigated and maintained. Mulch or similar ground covering is only permitted when no contact is made with combustible exterior walls or plants.
Why? Many of the large fires were spread by embers starting many small fires. If these embers land in combustible material near your home it is almost certain to ignite. Likewise, if a plant below a window catches fire, it is likely to break the glass and spread the fire inside. Reducing fuel around your home will reduce the likelihood of an ember lighting your home on fire.
Get creative and check out some great ways to harden your home in style.