Clear plastic storage boxes make great DIY mini-greenhouses. They're cheap, keep the cold out, and let the sun in. Drill a ...

Plastic sheeting is used as a covering to help let in plenty of light while keeping the cold out. The greenhouse is also heated, and can maintain a 40 deg F temperature differential with 14,000 BTUs.

You’ll need wood for the frame, and clear plastic sheeting or glass for the exterior covering to allow sunlight to reach your plants. Wrap the Greenhouse in Plastic: Use the 6-mil plastic vapor ...