The flora in the Little Butte Creek watershed is predominately temperate coniferous forest, which makes up approximately 65 percent of the total area. The lower regions are covered with chaparral, and the upper regions by fir forests. The chaparral region is inhabited by oaks such as garry oak and California black oak, with an understory of buckbrush and manzanita. Coast douglas-fir, sugar pine, ponderosa pine, California incense-cedar, and white fir are the most common trees found in the mixed coniferous forest. Shasta red fir, white fir, and the noble fir grow in the higher elevations of the watershed. Mountain hemlock, lodgepole pine, Sitka mountain-ash, and squashberry also grow in this region. Chinquapin can be found around Fish Lake. The most common species of plants above near the tree line on Mount McLoughlin and Brown Mountain include whitebark pine, mountain hemlock, Coast Range subalpine fir, heather, and mountain heather.