I don't think I would start many this time of year only a few, if they do well you will have a jump start on next year but as your other Q. Coco is something I only done two times and never plan on doing again. Keeping the plants going in coco over winter would be a headache IMO and Coco really does need Coco nuts to do best. I say Soil if your wanting to over winter them and then next year if your hearts set on Coco wash all the soil off and put them in Coco at that time.