Have been collecting seeds, are there any I can plant now or do I wait for spring?

[MegaLegs]

I've been collecting seeds from hardy annuals such as Cosmos, Calendula and Nigella and also some perenials such as penstemon and echinacea. Can I sow them now and over winter in a cold greenhouse or should I wait?

You could sow Nigella direct onto the ground where you want them now, but if you are growing in a greenhouse wait until spring as you will probably get leggy plants by the time you plant them out.

Sweet peas if you have any can be sown now.