Turnips would make great feed for your sheep in the winter too. With a little bit of threshing. I honestly wish I could be there just to set you up a garden.

I know it is an odd wish but I believe that everyone should have a garden to grow their own stuff. If you had the space a victorian styled kitchen would be perfect. Maybe a Scottish variety to cope with the temperature there.

Honestly I would set up several vegetable plots, a witches' garden, a few herb beds, a small orchard and maybe set up a small field of sugar beet or meadow grasses. But it is the amount of time to put into it. It would take me a year to set it up and up to 3 more years to see full results from it. But the sheer amount of food you can get from it, would be enough to feed you almost all year around, as well as feed your beasts in winter. I set one up before for an estate as part of a group. It was fun yet so hard. The worse bit was lining the beds with stones. We carried them by hand over an acre of land. then the trenching... best way to get manure into the ground but digging those lines took ages.