Sweet gum grows best in moist, rich soil but also tolerates dry, sandy soils. Trees are well suited for park, streets, highway and informal plantings. Sweet gum is relatively free of insect and disease problems. Leaves appear early in spring and remain attached until late in fall. This tree is not too widely used since wood is brittle and sharp pointed burs drop in the fall. Liriodendron tulipifera Magnoliaceae. Tulip-Tree, Yellow Poplar or Tulip Poplar. Central and Northern area. Deciduous. Native. Tulip-tree may reach a height of 100 feet in Florida at maturity, with a broad spreading crown and straight trunk devoid of branches to great heights. Young trees are pyramidal. Leaves are alternate, 6- to 8-lobed, 3 to 7 inches wide and about the same length (Fig. 40). Flowers are 2 inches long, tulip-like with greenish-white petals orange colored at the base. Tulip-trees occur naturally along streams as far south as Orange County and, although they do best on moist soils, can thrive on drier lands. Tulip-tree is excellent as a fast-growing shade tree and should also be used in naturalistic, park, woodland and lakeside plantings. Fig. 40.-Tulip tree (left) and flower and foliage of the tulip-tree, Liriodendron tulipifera.