I have 4 very old PeeGee Hydrangea trees (30 + years!) that are not doing well this spring. They are multi-stemed trees which have just this year had a some "stems" completely die back, many more dead branches than usual. One of the most stressed specimens is showing a lot of new growth on all the stems at about 3' high. I am wondering if I should prune them way back?
There also appears to be some borer holes, but I don't know of a type of hydrangea borer. My rhododendrum (also very old) have dieback (which started at the end of last summer)that I think is from borers. Could they be also infesting these old Hydrangeas? All are struggling all at once!!
I have 4 very old PeeGee Hydrangea trees (30 + years!) that are not doing well this spring. They are multi-stemed trees which have just this year had a some "stems" completely die back, many more dead branches than usual. One of the most stressed specimens is showing a lot of new growth on all the stems at about 3' high. I am wondering if I should prune them way back?
There also appears to be some borer holes, but I don't know of a type of hydrangea borer. My rhododendrum (also very old) have dieback (which started at the end of last summer)that I think is from borers. Could they be also infesting these old Hydrangeas? All are struggling all at once!!