I would think it would work fine with all of the above. Winter sowing basically allows plants to undergo a period of cold moist stratification before germinating, and sometimes to get a little jump on spring. I tend to plant all my native plants in the fall and then they come up in the spring, sometimes directly in the ground, and sometimes in an unheated greenhouse or cold frame. When the latter, I water them periodically all winter. Try it, if the germination ecology of the plant is appropriate to the method it will work, if not it will not.
Western Montana gardener and botanist in zone 6a according to 2012 zone update.
Gardening on lakebed sediments with 7 inch silty clay loam topsoil, 7 inch clay accumulation layer underneath, have added sand in places.
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