Campanula glomerata · Perennial
Powdery mildew: Improve air circulation and water at the base; apply a fungicide if severe.
Slugs and snails: Use physical barriers, iron phosphate pellets, or hand-pick at night.
Aphids: Spray off with water or use insecticidal soap; encourage natural predators like ladybirds.
Root rot: Ensure well-draining soil and avoid overwatering; remove affected plants if severe.