I would go later than October.. I winter sowed mine in milk jugs in late December / January a few years ago.. had great success .. the ones I sowed were oriental poppies ... the coco coir made it easy to transplant them into cow pots when they grew up.. and was easy to separate with all the perlite I added in.. granted they didn't bloom 1st year.. but have been giving me blooms year after year since
