Veronica austriaca · Perennial
Aphids: Squash by hand or spray with a horticultural oil-based insecticide if infestations are severe.
Powdery mildew: Improve air circulation and water at the base; apply a fungicide if necessary.
Downy mildew: Remove affected foliage and avoid overhead watering to keep leaves dry.
Fungal leaf spot: Clear fallen debris in autumn and ensure good air circulation around the plant.
Root rot (Phytophthora): Ensure well-drained soil and avoid overwatering; remove severely affected plants.