Sowing left over [from Spring] seed

What to do with all the packets of seed that I SHOULD have sowed in the Spring?

Worth sowing any in the Autumn and overwintering for stronger / earlier plants next year, or hang on to it and sow for next spring?

Obviously I've got a range of types, including some things that require stratification, so its a general question. I've heard of sowing Hardy Annuals in the Autumn to get bigger plants in Spring, for example. Anything (hardy) that won't benefit from that approach?

I could raise some to over winter under lights ... and maybe some I could cram two seasons into? (I thinking of things like Arisaema which seem to me to do a short first season anyway and then needs cold period before resuming in second season, I could give that a few months, including using artificial light if it isn't really to go dormant before the real winter arrives)

 

I've not sown annuals in Autumn Kristen, but I'd be inclined to think the earlier they are started the quicker they'd finish flowering.

 

Cerinthe should be safe in a cold frame/greenhouse if you have any of them.

That sounds like a half decent plan for the Arisaema. I did a similar thing this spring with some Lachenalia species seed expecting the usual crap summer - it's been a battle keeping them going these last few weeks!