Iris laevigata Credit: Tatyana Shulkina

Rhizomatous plant 60-90 cm. Leaves 75-90 cm x 4 cm, surpassing the stem. Flowers blue, 3-4 at the top of the main shoot and also 2-3 flowers on a lateral shoot. V - mid spring to mid autumn, in St. Petersburg May-October. Fl - June for 2-3 weeks. Fr - August. P - by seed and division. Shade tolerant. Z 4.

Siberia (eastern regions), Far East (Sakhalin, Kamchatka, Kuril Islands), Korea, Mongolia and Japan. Meadows, swamps, lake shores, river banks.