Melissa officinalis · Perennial
Sage leafhopper: Monitor regularly and use insecticidal soap or horticultural oil if infestations become severe.
Verticillium wilt: Remove and destroy infected plants immediately; avoid replanting mint family members in the same spot.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate-based slug pellets around the base.
Powdery mildew: Improve air circulation by thinning dense growth and spray with a bicarbonate solution if needed.
Root rot: Ensure well-drained soil and avoid overwatering, especially during winter months.