I have been growing coleus plants for many years. I plant them in beds for the summer months and they grow into beautiful bushes. In late fall, I take clippings and place them in water until roots appear. I then plant them in flower pots for the winter months and keep them in a sunny window. The past two years they have been getting some kind of disease. I noticed these white growths on the stems. Can you tell me what is causing this?
Certified GKH Gardening Expert
Without a photograph, this is difficult to identify. How healthy do the cuttings look otherwise - do they look wilty? Is your soil soggy - is it possible you are over-watering?
My best theory is that it is mold, mildew or a fungus.