The blooms are borne in clusters of up to 3 in the axils of the stem's upper leaves.
Special Considerations
Special characteristics:
aggressive
- Self-seeds prolifically and spreads rapidly by running roots.
non-invasive
not native to North America
- Native to Europe and Asia Minor
Growing Information
How to plant:
Propagate by
seed,
division or separation
- Divide in spring or fall. Self-seeds prolifically.
Maintenance and care:
Usually requires staking. Remove faded flowers, or cut back entire flower stalk when mostly faded. Cut before seeds mature to prevent widespread self-seeding. Cut plants back by 1/3 after blooming to encourage compact growth and rebloom. If foliage becomes unsightly after blooming, cut back to basal foliage. Mulch heavily for winter.
