They just go outdoors in a box exposed fully to snow, cold winds, and everything else that happens in the winter. It does get cold here in the winter and we can have 2 or 3 feet of snow. Then in early spring I start to water them daily. Water them daily all spring, they are really quite thirsty at this time. During the heat of summer water less, just give an occasional heavy soaking.
Most germination takes place in the spring or early summer.
In the fall cool and dry.