A hoop house (AKA polytunnel, polyhouse, hoop greenhouse, grow tunnel or high tunnel) is an outdoor growing area made from semicircular frames of steel, wood, or plastic covered in polyethylene plastic. A hoop house is heated by the sun and cooled by the wind allowing for an extension of the growing season. Hoop houses can be simple and inexpensive structures or highly advanced, utilizing electronic ventilation, heat, and humidity controlling apparatus.
A gutter-connected greenhouse is a freestanding polyethylene growing structure that can be expanded width-wise by their gutters at the eave line. The common sides of two adjacent gutter-connected greenhouses can be eliminated providing greater uninterrupted growing space. These structures are advantageous as they are inexpensive, allow for unlimited expansion with efficient use of space, allow for easy passage from section to section, and require less heat thanks to the fewer exposed wall surfaces.
A glass greenhouse (AKA a glasshouse or hothouse) is an outdoor structure made of wooden or metallic frames with most or all of its surface covered in translucent glass. Glass is preferred over plastic covering by some because of its beauty, light management properties, and permanence at the expense of cost and versatility. Modern greenhouse glass is annealed, laminated, and/or tempered to control natural heat and has the advantage of filtering harmful UV rays which prevent burning in many plants.
Gothic-arched greenhouses feature walls that are bent over the frame making a graduated curve that peaks at the roof. The half teardrop shape of the roof allows for easy run-off of snow and rain and can withstand heavy winds. This style keeps construction costs low as there is no need for structural trusses, and provides more overhead space at the center though there will be less vertical space closer to the walls.
Light Deprivation Greenhouses (AKA “light dep”) are growing structures that offer cannabis growers all of the flowering control of growing indoors with the cost benefits of growing outdoors. These structures can resemble any style of greenhouse with opaque tarps or panels that can be automated to block sunlight at certain times to simulate shorter days and “trick” the plants into flowering on schedule. The product of “light dep” is a larger, denser, and more potent cannabis flower that can be harvested several times a year while minimizing heat and lighting costs. Light deprivation houses can be supplemented with heating, ventilation, and indoor lighting systems to maximize control. Though light deprivation houses require a heftier start-up cost, it’s offset by the reduced costs, a lowered carbon footprint, and higher yearly yield.