I reckon you could sow some now, Alan, but maybe consider planting them in small clumps, because even with a late variety, they won't be that big, but if you have lots, then so what!
A 4" pot of - say - five seeds or so, could get going in a nice sunny spot, and would be 'biro refill' by August/September, and afterwards, a quick transplant into any spare soil would be worth a pop!
I'd have a go!