I keep mine fresh by keeping them in a dry plastic bag. Most of the time when you purchase from a store they are soaking wet. Shake them off and place the hole bunch in a new bag. It's also a good idea to keep the bunch of greens whole with the stems still conected, as you need them pull them off. I make my salads weekly and keep it in a plastic tubberware. Rinse the greens cut them up in smaller pieces, Put a paper towel on the bottom to hold excess water greens on top then another paper towel on top. If the paper towels get to moist change them. Some of the greens that are good are Collard greens, Escarole last extremly long, chicory, dandalion greens and flowers can go bad fast if kept to moist, endive, arugala, mustard, and kale once and a while. This has worked for me and as pieces go bad remove them. Most of my greens last over two weeks like this.