Gary
I planted my spring cabbages (Durham Early) out on the last day of September straight after removing the runner beans and they were all still pretty small at the end of March.
We’ve harvested 4 so far for leaves only (started around 10th April) and are taking 2 at a time for a meal using leaves whilst waiting for the larger ones to heart up, such as they do.
We’re hoping they will last out to the end of May, as swede and corn are to follow the last to be harvested whilst leeks transplanted out will fill the remainder of the space.