I have a ceanothus "Italian skies" which appears to have died. It has been established a few years and flowered well last year. However this year a lot of it appears to be dead with no foliage buds. There are some small buds but some of them are dying off. Was this due to the cold weather or has it been overshadowed by my forsythia bush which appears to have spread over the ceanothus. Or is there some other reason.