It does really well with wintersowing, and yes it does need cold moist stratification. It is always possible you might get a sprout without it though. Prairie Moon Nursery shows it only needs 30 days stratification. You could try mixing seeds in a baggy with moist potting mix or other media and keep in the fridge for a month and then sow them outside. Save some seed to wintersow as well for next year. Milkweeds have long taproots and don't like to be disturbed, so get any resulting seedlings in the ground sooner rather than later.
http://www.prairiemoon.com/see...
