“Weeds,” as used in this article, includes any of the following:
(a)
Weeds which bear seeds of a downy or wingy nature.(b)
Sagebrush, chaparral, and any other brush or weeds which attain such large growth as to become, when dry, a fire menace to adjacent improved property.(c)
Weeds which are otherwise noxious or dangerous.(d)
Poison oak and poison ivy when the conditions of growth are such as to constitute a menace to the public health.(e)
Dry grass, stubble, brush, litter, or other flammable material which endangers the public safety by creating a fire hazard.
Source:
Section 39561.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=39561.5..