Veronica · Perennial
Downy mildew: Improve air circulation, water at the base in the morning, and remove infected debris.
Leaf spot fungi (Stemphylium/Septoria): Remove fallen leaves promptly and ensure good airflow to keep foliage dry.
Powdery mildew: Avoid drought stress and maintain good air circulation to reduce humidity around the plant.
Grey mould (Botrytis): Remove affected shoots immediately and avoid overhead watering to prevent leaf wetness.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate pellets around the base.