What is this plant and when should I transplant it and feed it?

This is Solomon seal. It is best divided and transplanted after it finishes blooming. It is a perennial and does not need much if any fertilizer. Mother Nature will take care of it.
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Related Videos:
Cutting Back Evergreen Solomon’s Seal in the Spring
Perennials for Blooms all Summer

Related Resources:
Evergreen Solomon's Seal
Solomon’s Seal