Tilia is a genus of of mostly large, deciduous trees native to Europe, Asia and North America. Known as linden or basswood in North America, they are popular ornamental shade trees with attractive dense foliage and fragrant flowers. Some species are quite tolerant of pollution and are a common choice for city street trees. Potential insect pests include Japanese beetles, scales, spider mites and aphids. Diseases are rarely a problem for lindens but may include anthracnose, canker, and powdery mildew.