Petunia x hybrida · Annual
Slugs and snails: Use physical barriers like copper tape or crushed eggshells, and apply iron phosphate-based pellets.
Vine weevil: Apply systemic insecticides to the soil or use biological controls like nematodes in late summer.
Powdery mildew: Ensure good air circulation, avoid overhead watering, and treat with a sulphur-based fungicide if severe.
Botrytis blight: Remove affected plant parts promptly and improve ventilation to reduce humidity around the plant.
Aphids: Spray off with a strong jet of water or use insecticidal soap; encourage natural predators like ladybirds.