Sow it in spring so you don't have to bother with over wintering seedlings. If you can give yourself time to do a few sowings, doing a few seeds every 2 weeks, you'll get a succession of flowering.
I was given just one seedling of this last year and it flowered for weeks and has had babies so I have free plants this year. Been in flower for weeks and still going strong.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I don't recommend you sow them now if you don't have a greenhouse. They are fiddly in containers/pots. But, if you have free draining soil, just sow into the ground now. They can grow quite quickly if you start them off next year in spring from indoors and slowly harden off in late spring.
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I was given just one seedling of this last year and it flowered for weeks and has had babies so I have free plants this year. Been in flower for weeks and still going strong.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw