Is this the hardy outdoor Hibiscus (H. syriacus) if so, they are notoriously late at getting their leaves and usually the first to drop them in autumn.

By simply scraping back a bit of bark with your thumb should tell if it's still alive....the wood will be green if alive, brown if dead.

I bought the same Hibiscus. They did say they would not do anything untill June i think. Mine are also just twigs. I have one i bought in a pot and that one is just sprouting, i expect the bare root ones will be later, but fingers crossed

Many thanks for your help I will jst hang in there and wait and see