seed starting in a greenhouse

[brickmark]

This is my first year with a greenhouse (unheated) ... the temps during the day in the greenhouse are in the 70's - outside 50's ... I have planted numerous annual seeds and a few perennials ... evening temps are in the 30's inside the greenhouse. Is this going to just slow my germination or cause them not to germinate at all.

[soil]

it will slow germination or even delay with some plants.

do a search here on the forums for "sweat chamber" you will get information that will help you, your greenhouse and your seed starting a whole lot.