Nearly the entire Diamond Peak Wilderness is covered with mixed stands of mountain hemlock, lodgepole and western white pine, and silver, noble and other true firs. Alpine flowers, including varieties of mimulus, trillium, lupine, penstemon, heather, and Indian paintbrush, are common along trails, lake shores, streams and in the meadows. Huckleberry and dwarf manzanita are common in the dense underbrush.