Trilliums are spring-flowering perennials that produce blooms with three outer sepals and three small inner petals. A common method to propagate trilliums is through division. However, do not divide them until they have multiplied and formed a healthy clump of flowers. At that time, you can divide trilliums in the late summer or early fall after they go dormant. You can also divide them in the early spring before the trilliums start to regrow, according to Cornell University.
Dig around the trillium clump carefullly with a trowel or garden fork so you not damage the roots. Trilliums are not planted deep, so digging about 3 to 4 inches should clear most of the roots. However, adjust the depth if necessary.
Examine the trilliums for rhizomes that have a shoot growing from them. Divide the clump by cutting off these shoots, or small sections that include such shoots, using a sharp knife that has been disinfected with rubbing alcohol.
Replant the trillium divisions in a partially shady location, just as deep as they were planted originally. Space the sections about 12 to 18 inches apart and settle them in with 1 inch of water.
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