10 Althea Rose Of Sharon Cuttings, Hibiscus Syriacus Rose Of Sharon Bush For Flowering USDA Zones: Hardy in USDA zones 5 to 9, making it suitable for a wide range of climates Height: Typically grows between 8 to 12 feet tall, though some varieties can reach up to 15 feet Shape: Can be grown as a large shrub or small tree Thrives in full sun to partial shade Prefers well-drained soil