California Code, Public Resources Code - PRC § 4373

(a) Any structure, building, or part of any structure or building located within 45.7 meters (150 feet) of the periphery of any exposed flammable solid waste shall also be maintained with a clearance of flammable material for a minimum of 45.7 meters (150 feet) from the periphery of the structure or building.

(b) Sound and living trees may be left standing within the areas required to be cleared of flammable material, provided the following requirements are met:

(c) Selected and isolated shrubs may remain within the areas required to be cleared of flammable material if all dead material is removed and each shrub is trimmed up so that fire cannot travel through the shrub canopy or pose a fire safety threat.