There is a great product by tupperware called fridge smart (or is it fridge saver?) that is designed to keep produce fresher longer. I have had success keeping greens fresh for 2 weeks, collards will last almost three. I wash everything and dry completly. Then I put the bunchs (removing any metal ties) into the fridge saver. These days I dont need it as much since I am feeding soooo many vege heads, but when my numbers get down to 4 or so I have great success with this. I am even able to keep a chopped salad mix fresh for at least a week and a half.
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Cindy
PHFaust
Email Cindy