seed sowing

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When would be best time to sow tomatoes , petunias , sunflowers , cosmos as seeds in a greenhouse under propergator .
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When would be best time to sow tomatoes , petunias , sunflowers , cosmos as seeds in a greenhouse under propergator .
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I've just started my tomatoes and cosmos in a propagator at home, I did my sunflowers in April last year.
Jason I would start them indoors if you possibly can they like the warmth to germinate once up in a week or two depending where you are. here on the south coast they could be transferred to the greenhouse
Is it a heated propagator? If so then sow now, mine are coming up. But is your GH frost free or heated? Because you will need somewhere to put the baby plants when you pot them on. If you haven't an electric propagator then sow them indoors on a windowsill, preferably with a radiator under the window sill.