Sweet shrub (Calycanthus floridus) has long been on my list of desired native shrubs--the fragrance, the maroon flowers, I could go on... I tried to buy one once and was foiled by a mislabeled plant, a viburnum with similar leaves that now nicely hides my compost pile.
While perusing shrubs at the nursery last fall, I chatted about sweet shrub with an employee, who generously snapped a seed pod off a bush and handed it to me, "try it." I finally did, and it is doing pretty well--though only one seed from the 12+ in the pod germinated. Not great odds. Now I have to determine when to pinch it to encourage it to grow bushy and lush, and when to transplant it.