It’s now been formally diagnosed. My game cover crop consists almost entirely of bolted radishes. The field has turned an attractive shade of pinkish white, and a sea of flowers stands at almost waist height. This is not what I had planned for, but it’s certainly better than just another field full of closely cropped grass and rushes.
On the plus side, if you walk through the cover when the wind drops, you can hear an almost constant whine of insects. There are bees, bumblebees and hoverflys everywhere, as well as a pleasing amount of butterflys and moths. It won’t be much use at providing cover for game birds, but in terms of getting the ecological wheels of the farm turning again, it’s just the ticket.