If your unknown is a component of the natural landscape select your state:
North America Alabama Alaska Alberta Arizona Arkansas British Columbia California Caribbean Islands Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Manitoba Maryland Massachusetts Mexico Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Brunswick New Hampshire New Jersey New Mexico New York Newfoundland North Carolina North Dakota Northwest Territories Nova Scotia Nunavut Ohio Oklahoma Ontario Oregon Pennsylvania Prince Edward Island Quebec Rhode Island Saskatchewan South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Yukon

OR if you suspect your unknown has been planted select your hardiness zone:
Any Zone Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Zone 9 Zone 10 Zone 11