Set out plants about 3 feet apart, in full sun and in a well-drained loamy soil. Choose your location carefully, as established plants put out extensive root systems and do not like to be moved.
Keep plants well-watered until established, after which time they are quite drought resistant. To dry the seedpods, cut them early in the fall before they become weathered and wrinkled. Keep them right side up in a dry, airy location until ready to use.