Over the last 3 years I've bought several Itoh peonies, but none have bloomed. They have beautiful foliage, and have become much bigger, but no buds nor flowers.

At the time of planting I found various contradictory instructions re depth: as deep as herbaceous, as deep as trees, somewhere in between. I chose the last option, and now am figuring they are too deep.

(1) Do Itohs take longer to settle in before blooming?

(2) If "no" to (1), then would it be OK to try to shovel-lift them higher (they're all in raised beds) and pack some soil under them, or should I dig them out completely and replant more shallowly?

Thanks!