Posted: 09/06/2013 at 09:07
Fresher the better with most seeds, primroses/cowslips especially. someoneon here recently said Monty D was sowing them green. I sow tham as soon as they're ripe snd they germinate. If you dry them off they may germinate.or they may not. This goes for a lot of native plants and you may be better off buying one plant, no more expensive than a packet of seed if you buy it small and collecting your own seed and sowing it straight away, or just let the plant seed and transplant the seedlings. Nothing native needs heat to germinate.
Do as nature does. That works for natives. When the plant is shedding seed, sow yours. Put it in a pot, cover with grit to help protect from washout in heavy rain. Put it up a corner somewhere outside and leave it alone. It will be watered when it rains, it will get chilled when it's cold and germinate when it's ready.
q-r, if you've started yellow rattle and let it seed you won't need to do anything else.