Welcome to Goy,.It just depends what they are,,as some can be sown directly into the garden.It's too cold for them to be left out at night yet,as they need hardening off,so in that case,no.can you be more specific,as to what you have sown please?

Sorry,Gary..that should read yes,not no..If you have only just sown them,they probably need to be inside anyway,as there are still some cold winds during the day...most need some warmth to germinate..

Yes it does totally depend on what flowers they are.
Can you add the names as a comment under these replies? Also say where you live as there is a big difference in climate between eg Scotland and Devon!

Good thinking Stera..I forgot about the area..makes a big difference..

thank you for your advice much appreciated