Siberian iris 'Blaue Milchstrasse'

Grow in well-drained, neutral to slightly acid loam in full sun or partial shade

Remove any dying foliage in autumn, old flower stems can be cut down after flowering. Tall varieties can have their leaf fans trimmed to one third of the total height to reduce wind rock while the plants are establishing

Propagate by division of rhizomes from midsummer to early autumn

Prone to slugs, snails and thrips

May be affected by grey moulds; some resistance to leaf spots