Hobo Cedar Grove Botanical Area is located near Clarkia in the St. Joe National Forest of Idaho in the northwestern United States. The grove is a 240-acre (97 ha) area containing old growth Western Red Cedar estimated to be 500 years old. The upper area contains Western Red Cedar surrounded by Oregon boxwood (Pachistima myrsinites). The lower portion of the area contain the giant cedars surrounded by Lady-fern.