USDA Zone: 4-9? Calycanthus floridus are large shrubs, growing 5-10 ft tall, with bright red petals that form a vinous flowers with a sensational and delicate fragrance. Sweetshrub is a native plant to Southeast USA and does best in full sun to semi-shade and regular to moderate water with mature plants being cold hardy in USDA Zone 4-9. Caring for Calycanthus floridus in a pot can be done in cold regions. It is best to use a humus-rich soil that is moist, but not soggy, and in full sun to semi-shade. The fragrant blossoms are a great showy feature and will reward you with an exceptional scent. Calycanthus floridus is easy to grow and care for, adding a tropical feel to any garden, as well as a delightful sensory experience with its sweet aroma.