Periwinkle Wilting and Yellowing: Likely Fungal Disease in Texas Heat

Your periwinkles suddenly yellow and wilt. In Texas heat, this often signals a fungal attack (possibly botrytis) that spreads quickly.

• Antifungals may help but soil-borne fungi are hard to eradicate.
• If they’re annual bedding plants, avoid replanting in the same spot for a couple of years.
• If perennial (lavender flowers), try an antifungal.
• Take a sample to your county extension agent for precise diagnosis.