Mentha spicata · Perennial
Mint rust: Remove infected plants and rhizomes promptly; heat-treat healthy rhizomes in 44°C water for 10 minutes to eradicate spores.
Slugs and snails: Use physical barriers like copper tape or crushed eggshells, and set out beer traps or nematodes for control.
Powdery mildew: Improve air circulation, avoid overhead watering, and apply a biological fungicide if infection is severe.
Blue mint beetle: Hand-pick adults and larvae regularly; encourage natural predators like birds and ground beetles.
Sage leafhopper: Monitor plants closely and use insecticidal soap or horticultural oil for heavy infestations.