6"-12". Highbush cranberry is also known as the American cranberry bush. Though not actually a cranberry, its fruit resembles cranberry with bright red color, matures in the fall, and persists throughout winter. A generally low maintenance shrub once established that will grow in moist to dry sites with plentiful sun. This North American native has white flowers, and dark green leaves that turn reddish in the fall. When mature reaches a height of 6-12 feet and a spread of 8-10 feet.