I planted a Rose of Sharon last year. It bloomed and looked very healthy. This year I see no sign of life ( no leaves or green anywhere) though the branches are not brittle. Are these plants typically late to leaf out?....Or did the late freeze we had this spring damage it? How long should I wait before removing it? Does the Rose of Sharon typically leaf out from existing wood or start new growth from the bottom of the plant? Thank you for your help!