I planted a hebe heartbreaker in August 2012 and it survived the winter beautifully, then suddenly about three weeks ago it started to go really brown. I think there may be just a few healthy small branches now. I'm assuming that the last heavy frost has upset it, but at a loss what to do now. I am watering regularly and have given a dose of soluble aspirin. Should I leave alone for a while apart from watering or would it help to cut off the dead foliage? Any advice please?