How can I rejuvenate 12 yr old juniper groundcovers that are very matted and seem to be dying back? These groundcovers do not seem to be very healthy and are matted down/together so I cannot get to the soil underneath. Some appear to be dead, others to be heading in that direction. If I have to remove, what is best way to do that?
I would cut back any dead plant material. Inspect your plant for any possible infestation. Sometimes just an overdue pruning may rejuvenate your shrubs.
If you decide to remove and start over, make sure you remove all old roots and plants before replanting your area.
Here is a link to proper care.