Dividing & Transplanting: Trillium don't like to be disturbed and can be hard to divide and transplant successfully, especially from your forest. However, it can be done. In your shade garden, you can dig and divide your own trilliums. Mark where your trillium are growing in the spring.
In late summer, after they go dormant, carefully dig the rhizomes, getting as much of the root system as you can. Gently separate out the individual rhizomes and replant in a location similar to where they were growing well. Keep watered, especially if you have dry conditions.
Digging trilliums you planted in your own forest is harder and less successful because the rhizomes often are growing in among tree roots and other plants. Removing the whole root system without significant damage can be difficult.
Pests/ Disease: Trilliums have few pests and diseases. In the shade garden, watch for slugs and snail damage on the leaves in spring. To reduce damage, remove the mulch away from the plants in spring to reduce hiding places for the slugs. Place organic baits, such as iron phosphate, around the area. The slugs and snails are attracted to this bait, but once they eat it, the iron phosphate will kill them. It is safe for kids, pets and wildlife.