Vegetation at Mount Jefferson is dominated by Douglas-fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several species of cedar. Vine maple, rhododendron, purple lupine, yellow lupine, Indian paintbrush, wild strawberries, and red huckleberries are also common around Mount Jefferson. Above the timber line at above sea level, mountain hemlock and whitebark pine predominate, though mountain hemlock has also invaded into subalpine meadows at Mount Jefferson, possibly as a result of fire control programs, grazing, the influence of adjacent forest areas, and climate change.