It sounds to me like it is "COLD" gardens. It's where you have a special bed or space in the garden set aside for your cold weather veggies. If you use raised beds and cover one with an old glass door or window, you can use it as a "cold frame", and by keeping it clear of snow, you can harvest well into the winter and start cold weather veg very early in the spring.
Many veg will over winter (root veg mostly, but Kale also), it makes sense when you are trying to eat fresh foods from your own garden more.
Many veg will over winter (root veg mostly, but Kale also), it makes sense when you are trying to eat fresh foods from your own garden more.