Campanula chamissonis · Perennial
Powdery mildew: Ensure good air circulation and water at the base to keep foliage dry; apply a fungicide if severe.
Rust: Remove and destroy affected leaves immediately to prevent spore spread and improve airflow.
Root rot: Plant in sharply drained, gritty soil or containers to prevent waterlogging, especially in winter.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate-based slug pellets around the base.
Winter wet damage: Provide winter protection by growing in a scree garden or well-drained container with grit.