I set aside an hour on the day I pick up my CSA box to clean, blanch, chop and freeze each type of green, then pack them in labeled freezer bags. I usually blanch the greens whole for 1-5 minutes, depending on their toughness, drain them into a colander, and gently squeeze out the excess water. Then I chop them into whatever thickness I want and freeze them in single layers on baking sheets. After about an hour, the greens are frozen enough to be packed into freezer bags without sticking to each other, so I can portion out as much as I need as I use them.
Have you ever done this? How do you get through all the greens in your winter CSA box?