Rose of Sharon. Bring a touch of the exotic to your garden with this beautiful deciduous shrub. Gaining real popularity as they are drought tolerant, once established, and cope with the blazing hot summer days that we are starting to experience more of. Fully hardy. Double showy blooms of lavender with deep red centres smoother the plant over mid to late summer and will often be in flower till the first frosts. Height 4m. Full sun.