Hi,
I'm a newbie with my
green house and mine is not completely air tight... but I would get a thermometer that keeps track of how cold it is getting at night. that would best determine if your transplanted plants would do ok in a
greenhouse this time of year....but you didn't state where you are from. Her in NE Wyoming I began, by
seed, peas, lettuce, radishes and spinach. But this is an espically warm
spring. I can't imagine needing lights in a
greenhouse this time of year. I did not grow late into the year last year, but hope to try some later plants this next fall/winter. I have started a lot of
seeds inside with a grow light, but not ready to put my cukes,
peppers,tomatos, etc. outside yet! Happy
growing!