Posted: 17/11/2016 at 23:29
Mostly seeds found in the wild? Wild in the UK (if you're in the UK)
You threw some trays outside and they germinated? That should give you a clue
Copy nature. No heat, no messing about. Sow seed outside somewhere shady at the end of summer or as soon as they are ripe and you can get them. Gritty compost so they don't get waterlogged. Grit on top so they don't get disturbed. Some will germinate within days, some after a winter's cold will germinate on spring. Don't bury them deeply, nature doesn't.
No native UK plant EVER needs artificial heat to germinate, if it did it would die out.