swiss chard will reseed and grow year after year in your
greenhouse, and most greens and herbs grow well in winter in the greenhouse..look for cool weather crops ..those that like cool weather for growin in the greenhouse..tomatoes and peppers do well in the summer inside the greenhouse..I'm in Michigan..don't bother with anything you can easily grow outside..you won't have that much room. I have tried melons and squash in the
greenhouse and they actually did better out in the open ..but that's just me.