Answer: Once the seeds have germinated you can set them outside as long as the temperatures are moderate and they are sheltered from wind. The reason for this is that they will dry out rapidly in wind or warm temperatures. The plastic covering may be helpful at night to protect them from cold, but during the day it may cause them to overheat much as a closed car will heat up. You might try putting them in a sheltered spot with morning sun and see how it goes. Remember too that you may have to bring them indoors or cover them with frost blankets and plastic if temperatures dip. Some of the more sensitive plants such as tomatoes should not be exposed to temperatures below about 45 degrees. Good luck with your seedlings!
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