List of U.S. state and territory plants and botanical gardens

This is a list of U.S. state and territory plants and botanical gardens — plants and botanical gardens which have been designated as an official symbol(s) by a state or territory's legislature. 5 U.S. states and 1 U.S. territory have an official state/territory plant. 7 U.S. states have an official state botanical garden or arboretum. This list excludes state flowers, state trees, and state grasses.

State lei-making material
In addition to Hawaii's state plant, Hawaii has official state flowers and lei-making material for the individual islands of Hawaii: