We have various hebes in our garden that I'm guessing have been there for years. In the 4 years we've lived here (Essex) they've looked healthy and produced lovely flowers. Since the very dry last summer though they all look distinctly 'under par'. Will they bounce back? Is there anything we can do to help them along or is it time to think about replacing them? Hope we don't have to as they provide privacy in our back garden. Any thoughts / advice would be appreciated ????