The spacious yet strong Grow-House Greenhouse provides the grower many of the features found in commercial models, yet at a fraction of the cost. The Grow House has a gothic-arch shape that provides structural strength and sheds rain and snow; 6-mil polyethylene glazing that captures 95 percent of available light; top and bottom vents that prevent overheating; and UVprotected PVC ribs that can't rust or rot. Available in three sizes (12 x 12, 12 x 16, and 12 x 24-foot), it can be assembled in a day by two people using ordinary hand tools.