Answer: You'll notice that many commercial greenhouses have walls and ceilings made of translucent, but not transparent, material so I think you should be OK. In fact, it may help keep the greenhouse from getting too hot in mid-summer. If you notice that your tomatoes are not thriving as much as you'd like, and they are being grown in containers, you can always move them outdoors. One thing to note: plastic sheeting will degrade in sunlight, and may not last more than one summer before becoming brittle and yellowed. There are some UV-protected plastics available -- made especially for greenhouses -- that should last more than one season.
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