|About three months ago I purchased two of your Avalanche Clematis. One has suddenly begun turning yellow, wilting and appears to be in poor health. The other one seems to be doing well so far. Are they subject to any particular disease?|
I don't think it is a disease, especially with that particular species of plant and those symptoms.
New transplants in summer are in for a stressful time. It takes months for a plant to get a root sytem established that extends far and wide enabling the plant to withstand the demands and stresses of summer with some resilience. In the meantime is difficult to keep the roots adequately moist without overwatering. Drought kills roots but when the soil is kept too saturated the roots cannot get oxygen and die. The goal is to keep the new plant's roots moist with regular watering until it has a few months to get some roots out into the surrounding soil so it is more resilient.
Thanks for the question. Please stop in again soon!