Posted: 31/07/2013 at 12:53
I experimented last year sowing in July and up to 1st August, and SOME of them (especially earlier sown ones) were big enough to flower this next year, most weren't but they are going to be HUGE plants next year! Expect about 4 weeks to germinate, only barely cover seeds with compost (they want light) but do NOT let the compost on the top dry out especially just at germination time or they will die.
I gave strong growing conditions and long season of growth by growing these July/August sown ones in my greenhouse...perhaps I should have fed them as well to encourage quick growth. Good luck, and do let us know results if you sow now. Carrie Thomas, Touchwood.