Blackberry, raspberry, and blueberry shrubs are also a common food source for bears. Flowering plants make for a beautiful sight in the Smokies. Trillium, Lady Slippers, Columbine, Magnolia, and Violets are common in early spring. Late
in spring, Mountain Laurel and Flame Azalea emerge. Jewel Weed, Pink Turtleheads, and Black-Eyed Susan are prevalent in the summer months. Moving into fall, Sunflowers, Monk's Hood, and Goldenrod take over. Fall is also the peak time for leaf-peepers wishing to set their eyes on mountains set ablaze by the turning of the leaves. Because of the climate in the Smoky Mountains, many non-native plant and animal species thrive, although they are usually found in Asia or Europe. Kudzu, garlic mustard, and mimosa are the most invasive plant species. Two problematic insects
are destroying trees and impacting both the ecosystem and scenery: the Hemlock and Balsam Woolly Adelgids. The Balsam Woolly Adelgid is of European origin but the Fraser Fir trees in the Smokies have no defense against it.