I planted out my winter leaves about a month ago, however through flea beatles, slugs and being distracted by work for a week I have lost mizuna and toi sim plants entirely. Is there any merrit in resowing in an unheated grow house to then plant out under fleece? Window sill growing not currently an option due to kittens.
You could try mizuna, the fastest grower, it would be ready to plant in a month or so and may struggle to establish in December, but if it does then you could have some pickings by late winter, and abundance by April.