How to Select and Store
Look for collard greens that have firm, un-wilted leaves that are deep green in color with no signs of yellowing or browning. As with most vegetables leaves that are smaller in size will be tenderer and have a milder flavor. They should be stored in the refrigerator away from any fruit or vegetable that continues to ripen such as apples to keep them from wilting and becoming bitter.
Place collard greens in a plastic bag, removing as much of the air from the bag as possible. Store in the refrigerator where they should keep fresh for about three to five days.
Tips for Preparing Collard Greens
Rinse collard greens under cold running water. Chop leaf portion into 1/2-inch slices and the stems into 1/4-inch pieces for quick and even cooking.