Why are the leaves on our clematis turning brown, and why are the flowers wilted looking? The plant is 2 years old. This is the 2nd year that we have had the same problem. Both leaves and flowers are affected. Symptoms have remained the same. The plant grows on a trellis that is in full sun. It is planted in amended soil that is good. The plant is next to the sidewalk. We have used no pesticides or fertilizer on the plant.
This is a common disease found on clematis , it is called Ascochyta stem blight.Prune out the dead stems , the plant will recover and may re bloom during the same season.https://extension.umd.edu/hgic/cankers-vines
All of the stems are dead at the base but green as it goes up the stem. However, the leaves on the stems have brown spots on them. Should I still cut them off at the base?
Yes. That is a typical appearance of the disease.