We have a set of beautiful standard iceberg roses and recently, pretty much overnight, one bush, right between two perfectly healthy, thriving bushes, has dried out to a crisp. The leaves are shrivelled and the plant stems have become brittle. I had only recently deadheaded the flowers, so there are no other 'symptoms' to report. No blooms, no spots or bugs present. The leaves have not dropped. They are still attached but completely shrivelled.
We are in Canberra, Australia--we have had some very warm to hot days but we water our roses well and they are well-cared for and fed.
Thank you for any idea on what might be going wrong--Google is bringing up nothing!
Thanks so much,