Dividing/Transplanting: Divide in spring if plant has outgrown its space; plant crown at soil level. Early Spring: Gradually remove any winter cover. Cut back old stems; large clumps may be divided.
Can you prune amsonia?
Plants must be cut back in either the late fall or late winter to about 8 inches from the ground. Remember to wear gloves when working with Amsonia since stems release a white sap. Though not required, cutting them back again half way to the ground after flowering will result in even fuller growth.
How do you propagate amsonia Blue Star?
Amsonia hubrichtii can be propagated by seed or division. Due to irregular germination, which occurs over several weeks, division is the most reliable method of propagating this plant. For growers interested in starting amsonia from seed, sow two to three seeds per cell (128- or 72-cell plug trays work well).