What things do you just leave in the garden till you need it?

I almost always have mustard greens growing here or there so we can always have them fresh--until it freezes. They seem to germinate over a long period, but there are some summer weeks with no germination and thus a lull in greens. I like the late summer to fall greens best. My son cooked some tonight and they were delic'.

Our soil does not freeze deeply and most winters it thaws intermitently. Turnips keep okay in the ground here and we have no trouble digging them up. Potatos, too, keep, eh, more or less okay in the ground, though I don't grow the best spuds in the first place.

Are there any grains or legumes that you can keep in the garden until needed? I haven't come across any. Beans and peas all seem to shatter open; mice and what-have you will get any grain. I think there is probably a safety issue with grains stored in the open weather, too. (Ergot and such).