Harvesting and sowing perennial seeds
by Laura Petrie
(Denholm, Quebec)
Doug has written about this in numerous articles - no problem doing what you're asking. Sow them where you want them. You simply have to recognize the seedlings in the spring and not weed them out. You won't get as good a germination outside as inside- and the ants/mice will get some seeds as food.
But yes it works just fine for most seeds.