Aphids can be washed off with a water spray. Leafminer larvae can produce discolored patches on leaves - remove and destroy affected leaves early to prevent spreading. Young leaves are a wonderful addition to salads. And be sure to try this recipe for Swiss Chard Pie . Pick leaves right before you're planning to use them.
Huge leaves can get tough, harvest in the smaller stages for better flavor.
Harvest frequently for increased production. Garden clean up - eat all leaves, compost stalks. Compost remaining plants when they die back in winter.