Hi I Need To Transplant My Mom’s White Trilliums. They Have Been In Her Garden Since May 1980. And At Her Previous Home.

Answer 1

Wait till they are dormant to transplant them, midsummer to winter, before they bloom in spring. Be sure the new location is ready with well-draining, moist, compost enriched soil. Here is more:

https://www.gardeningknowhow.com/ornamental/flowers/trillium/growing-trillium.htm