|One of my rock roses (purple cystus) appears to be withering away. This is a 5 year old stand and has thrived and flowered each year. This one plant is gettting a scorched look from ground to top of stem. This is a large specimen and it is happenning progressively. I have been cutting away the dead branches which has now left me with less then half the shrub. All the other rock roses around it are doing great.|
|It's really difficult to diagnose a plant problem without seeing it, but I will offer a possibliltiy - rock rose is susceptible to root rot if the soil doesn't drain well. I'd also check for spidermites. These tiny insects feed on the foliage and cause a withering, stippled appearance. Continue to prune away the affected plant parts (in case of spidermites). Next spring, if the roots are healthy, they will develop healthy new stems and foliage.|
Best wishes with your rock roses!