It is recommended that gardeners in zone 5 should add a 2" layer of mulch in fall. Best planted in large groups of 15 bulbs per square foot. Good drainage and a sheltered location will help them survive the winter to return for years to come. Select a planting site that has reasonably fertile soil and plenty of moisture that will not allow the bulbs to dry out in summer. Care Tipĭutch iris bulbs can be planted in spring or fall. ![]() Propagate in the fall by division after they have been chilled for four weeks in a moist medium. ![]() Divide only when containers or planting spaces become too crowded. Popular perennial iris flower types are German iris, Dutch iris, Japanese iris, Siberian iris and Louisiana. In zones 3-5, place the container in an unheated garage or shed.Īfter blooming, leave the bulbs in place so plants can clump or reseed. Place them near the foundation of the house or other structure. In zones 6 and below, you will need to protect your bulb containers. Mulch in extreme climates.įor container planting, bury the bulb three times as deep as the bulb is wide. Plant in the fall, before the first frost hardens the soil. Naturalizes well if happy where it's planted. ![]()
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