Fringed-sage is susceptible to powdery mildew, a fungal disease that appears as white powdery spots on leaves, stems, and flowers. This disease thrives in humid conditions and can weaken the plant over time.
To prevent powdery mildew, ensure good air circulation around the plant, avoid overhead watering, and remove any infected plant parts promptly. Another common pest that affects Fringed-sage is spider mites, tiny insects that suck sap from the plant, causing leaves to yellow and wither.
To prevent spider mites, regularly inspect the plant for any signs of infestation, and if detected, treat with insecticidal soap or neem oil. Withering of Fringed-sage can also be caused by root rot, typically due to overwatering or poorly draining soil.