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non-aggressive - Prolific self-seeder in moist sites, but seedlings seldom go far and are easily removed.
non-invasive
not native to North America - Native to Siberia, Eastern Mediterranean

Growing Information

How to plant:

Propagate by seed, division or separation - Cultivars must be propagated by division, as they do not come true from seed.
Plants self-seed prolifically but are easy to control. Plant seeds in summer and transplant in fall.
Divide in early spring. Take 3- to 4-inch root cuttings when plants are dormant and root in containers overwinter.

Maintenance and care:

Keep soil moist but not soggy.
Deadhead to prevent reseeding.
If foliage deteriorates in summer, cut to ground to encourage a new flush of growth.
Divide in spring. Division required only every 6 to 10 years.
More growing information: How to Grow Perennials

Pests:

Slugs

Varieties

�Hadspen Cream� has pale green leaves bordered with creamy white markings. Does not tolerate afternoon sun well.
�Langtrees� has deep green leafes with silvery dots.
�Variegata� ('Dawson's White') has leaves with wide creamy white borders, prefers moist shade, and will not tolerate sun or drought.