kale, especially russian kale is pretty hardy. it will provide you with an early season crop of greens before it bolts. if you never want to buy kale seeds again, let some go to seed, and you will have an ample supply. the lacinato kale is not as winter hardy.
i have had kale survive the winter even when deer got into the garden, and left just a stub. that stub grew back in the spring time.
kale is tough.
i also will have potatoes that i missed sprout in the garden come spring time. our winters can be severe, but we have a three or four foot blanket of white mulch most of the time that protects the greens, and spuds.
keith
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