It's a little early yet where you are, but if you have plenty of space and your greenhouse is in full sun, take a chance with a small sowing, back up with a sowing in two weeks time.

Personally, with small seeds such as begonias, lobelia and petunias, ive always got them in early to mid feb...providing you can give them 60f + for germination and 50+ for growing on.

Thanks , yes I will try and sow a few and see how they get on .