I have had mixed results with winter sowing. When planting directly in the garden, many of the seeds hooved up out of the ground during the winter months and then froze out. Not to mention that weed seeds did sprout and outgrew the daylily seedlings! When I planted in big tubs, I was mistaken to think that the seeds would be OK if they got frozen... WRONG! If the seeds begin to sprout and then become frozen, they are gonners. Best to plant later and allow the seeds to chill just before a natural spring unless you intend to keep them indoors under lights or in a greenhouse. I grow mine indoors under lights after planting seeds in deep cat litter trays and start them after Jan 1st here in Ohio. The seedlings will be good sized by the time I plant them in the garden in May after danger of frost has passed. There are endless ways of doing it based on your own personal preferences, but I just mix all of my seeds together.... I do lose a few, but I always have way more than I need anyhow.