False sunflower (Heliopsis helianthoides) is a native of the tallgrass prairie, and it makes a wonderful addition to a sunny perennial garden. It is fairly large and upright when grown in full sun, growing 4 feet wide and up to 6 feet tall. It tolerates a wide range of soils but prefers drier, well-drained beds. False sunflower blends in nicely in the late summer garden, with yellow flowers 2 to 3 inches in diameter, appearing in late summer and early fall. As with all sunflowers, it is a magnet for butterflies, honeybees, and hummingbirds.