Any idea of the cause and maybe a solution?
The weather? (but normally it seems to like the wet, which we had plenty of here till this last couple of weeks).
Over harvesing it last year?
Maybe it needs dividing? It has been undisturbed for about 6 years or so.
doesn't like its neighbours? Nearby are growing lavendar, a honeysuckle and some canna lilies, which have been there a year or so.
Hope someone can advise.
Thanks
