Vinca Flower Leaves Curling. Jul 02 2014 A basket of well drained vinca Cora Deep Lavender -- what healthy vinca flowers should look like. Several types of rot may affect a vinca causing its leaves to yellow and even fall off the plant.
Aug 26 2019 Yellow vinca leaves can be caused by a large range of environmental factors. A soil test available at. To me which used to be in Vinca genus and is still sold AFAIK with tags that say annual Vinca.
This should not be cause for alarm.
Leaf roller insects infest both vinca major and vinca minor. Thielaviopsis basicola also known as Chalara elegans is the fungus responsible for black root rot. This virus disease shows up occasionally in landscape plantings of vinca and many other herbaceous plants. It looks like Madagascar periwinkle.