ok so I have a Palram 6x8 Green live in central pa. Here is what I am thinking as long as it does not get below freezing I can keep all my seeds out in the greenhouse, or do I need some sort of heat source below a certain temp? any help would be appreciated
Your approach should work fine for cool weather crops such as lettuce, cole crops, sweet peas, etc. But warm weather seedlings will not fare very well if temperatures drop much below 50 degrees for extended periods of time. When the temperatures inside the greenhouse begin to hit over 70 degrees during the day and drop down no lower than the mid forties at night then I would expect heat loving seedlings to do o.k. left overnight.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques. Alex
agree, that "keep all my seeds" in the greenhouse is a little vague. Did you mean germinate your seeds? Then no, not without bottom heat added for all the warmer weather stuff. If you meant store seeds out there, sure.