Variegated periwinkle problem! Help!
When I planted my variegated periwinkle (Vinca Major 'Expoflora') this spring in a pot it looked so beautiful! As the summer began, the periwinkle began to die off stem by stem. Died right down to the level of the soil. I tried moving the plant to a shady spot and it still kept dying back. Finally I did some research into the problem and I believe I've identified the issue as "dieback." A recommended solution to prevent "dieback" is to avoid overhead watering. This question might sound silly but I'm wondering if the issue is "dieback" and I should avoid overhead watering, how am I to water my periwinkle? Water into the soil and not the top of the plant? What if my periwinkle was planted into the ground? Water above the plant and allow the water to run down? Any solutions/advice on caring for periwinkle would be wonderful!