Calin, I'm not sure about sowing now but maybe sme of the others will have better advice for you. I started mine indoors in Febuary. They need to be kept moist untill the seedlings start to grow, so maybe placing your seed tray them in a bag or propagator would stop them drying out, but I'm not sure if it might be a bit too hot for them now? I'm not sure maybe others with more experience will have better advice for you.
Mine all came from a a packet of mixed bought very cheaply on Ebay. I think it's just luck of the draw what you get.
This is the seller I got mine from and I've got a nice mix of different colours and forms
http://www.ebay.co.uk/itm/Semp...