Bulbs · bulb or rhizome

Iris from seed

Iris spp. · also searched as growing irises from bulbs

Sowing depth: Dutch iris 6 to 8 in (15 to 20 cm); dwarf 3 to 4 in
Before sowing: Bulbous iris go in the ground in autumn. Bearded iris rhizomes are planted with the top at the surface.
Spacing: 3 to 4 in (8 to 10 cm)

Sowing

Bulbous iris: autumn planting, Dutch iris 6 to 8 in deep, dwarf iris 3 to 4 in (Fedco). Rhizome irises are planted shallow, partly exposed, in summer.

Care and transplanting

Divide crowded rhizomes after flowering.

Problems

Rot in wet soil; iris borers in some areas.

Saving seed

Seed-grown iris takes years to flower; divide named varieties.