fall / winter vegetables in zone 6
i have four 4x4' SFGs, and i am currently growing radishes and carrots, spinach and kohlrabi. these have all been recently planted from seeds.
i still have a lot of spaces left, and would like to continue to plant through the fall, and harvest through the winter (as long as possible), extending the season by use of PVC hoops and plastic covers.
for the suburban philadelphia area, is this possible? i am thinking of lettuce, mache, more radishes and carrots, spinach...
any other ideas?
thanks in advance,