I want to start some seeds early. Petunia, Impatien, watermelon, tomato and cucumber. I can start them in house so they can germinate. After germination i would like to move them to a outdoor building with lots of windows for light but no heat. Can I just cover them on cold nights like I do my other outside plants when we have a late spring frost?
You can start them indoors as long as you time it right for outdoor planting in your area/zone.
Check the almanac for this info.
As far as frost.. some young plants cannot handle the cold even if covered.
Let's get some other opinions on this..