When do you transplant casablanca lilies?

Casablanca lilies should be transplanted in the spring after the last frost, when the soil has warmed up and the risk of cold weather has passed. This timing allows the plants to establish their roots during the growing season. If you're transplanting established bulbs, be sure to do so when they are actively growing but before flowering occurs. Ensure you choose a well-draining location with plenty of sunlight for optimal growth.