Planted in the garden. Had hard freeze. All leaves are burned. Do I prune it or wait too spring. Or is it dead
Wait for new growth before pruning. The dead foliage, even though ugly, can provide some protection of the stems from further freezing.
It's preferable to cover it when frost is predicted.
It's hard to know at this stage how extensive the freeze was into the stems and roots. It may re-sprout from the stems or from the root crown when the weather warms in spring.