How do I keep premium mint leaves large, green and free of rust spots for buyers?

Buyers reject mint for three things: small leaves, yellowing, and rust spots. To keep leaves large and green, give the plants rich, moist, well drained soil with steady nutrition and water (mint likes consistent moisture but not waterlogging), partial shade in very hot areas to stop scorching, and keep cutting so the plant pushes fresh tender flushes rather than going woody or flowering. Pinch off any flower buds, because flowering makes leaves small and tough. Mint rust shows as orange or brown pustules on the underside of leaves and spreads in humid, crowded conditions; manage it by wide spacing, good airflow, removing and destroying infected leaves and runners, avoiding overhead evening watering, and replanting clean runners if a bed gets badly infected. Since this leaf is eaten fresh, keep chemical use minimal and follow label and PHI strictly, checking with your KVK, because hotel and export buyers are strict on residue. After cutting, cool the mint fast, keep it out of direct sun, and pack and deliver in cold boxes the same day. The faster you cool and deliver, the better the leaf holds and the fewer rejections you get.