The almond (Prunus dulcis, Prunus amygdalus), walnut, pistachio, and pecan are each the official state nut.
Cal. Gov. Code § 422.3
State Flag and Emblems
Added by Stats. 2017, Ch. 49, Sec. 2
Official source: California Legislative Information. Reproduced from public-domain California statutes; confirm against the official source for the current text. Not legal advice.