I have an 8ish year old cistus in my garden. Perfect spot in the sun and It has been the most prolific flowerer and resilient to whatever nature has thrown at it. Unfortunately this year it has a lot of brown woody branches with no flower buds. There are branches with buds and also some which are in full bloom. I have never pruned this shrub - I don't know why, I must have heard somewhere that I shouldn't. Now having googled it, I read it should be lightly pruned each year - and - that its lifespan is perhaps only eight years or so.
Up until today I had thought the dead branches were due to frost damage and was going to cut them out. Now I don't know whether it's reaching the end of its natural life, if it is suffering from lack of pruning - or - if it has frost damage. Does anyone have any ideas about the best approach to take at the moment? I thought I would have it forever - it was so happy and reliable