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The glass greenhouses are filled with equipment including screening installations, heating, cooling, and lighting, and may be controlled by a computer to optimize conditions for plant growth. Different techniques are then used to manage growing conditions, including air temperature, relative humidity and vapour-pressure deficit, in order to provide the optimum environment for cultivation of a specific crop. A greenhouse is a special structure that is designed to regulate the temperature and humidity of the environment inside. There are different types of greenhouses, but they all have large areas covered with transparent materials that capture sunlight and heat. Greenhouse, building designed for the protection of tender or out-of-season plants against excessive cold or heat. In the 17th century, greenhouses were ordinary brick or timber shelters with a normal proportion of window space and some means of heating.
Position and Brace the Gable End
There were serious problems with providing adequate and balanced heat in these early greenhouses. You simply won’t believe all the extra space the double wide delivers and how straightforward it is to literally grow your crop. When building a greenhouse on sloped land, an uneven span is often the most efficient design. It’s a variation of the gable design, with one side of the roof — usually south-facing — much longer than the other to maximize light intake. We purchased a screen door from a home center to fit our door opening. We removed the screen and replaced it with a clear version of the polycarbonate we used on the rest of the greenhouse.
Greenhouse
Some greenhouses are very easy to assemble, particularly those that are small and basically consist of a simple frame topped with a polyethylene cover, like our best budget pick, the Miracle Gro Transparent Greenhouse Kit. Along with greenhouse size, you also need to think about where you’ll install it. According to James, a greenhouse should be placed where it will receive mostly sunlight throughout the day, although a little shade is acceptable. If you need a portable option for occasional use, we love this lean-to greenhouse from Eagle Peak.
Dutch Light
Even if you live in a more temperate region, a greenhouse will create a perfect climate for plants, protecting them from temperature swings, storms and pests. We built our greenhouse from cedar, which weathers beautifully, and polycarbonate sheets, which diffuse the sunlight and give even exposure to all the plants. If not, you can often install shelves yourself, or add a small freestanding shelving unit if necessary. The Outsunny Greenhouse has a tear-proof and UV-protected polyethylene cover and a steel frame.
Gable-style
(Some galvanized siding nails will leave a blue streak on the cedar when water passes over it.) Each course of siding overlaps the next, leaving six inches of each course exposed. After making the cuts, place the parts of the truss back on the template, line them up and fasten the peak together with a screw. After determining the location of the collar tie, fasten another block to the template so you can repeat the location on the rest of the trusses. Other large greenhouses built in the 19th century included the New York Crystal Palace, Munich's Glaspalast and the Royal Greenhouses of Laeken (1874–1895) for King Leopold II of Belgium.
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What to Look for in a Greenhouse
The greenhouse comes with two wooden shelves to hold your smaller plants and pots, and there is plenty of floor space for larger plants. A lean-to greenhouse is installed against a wall or is wall-mounted, so the solid wall provides extra protection and stability. We chose the Outsunny Lean-To Greenhouse as our top choice in this category because, at under 5 feet wide and less than 4 feet deep, it's the perfect size to fit against the side of a house and is easy to move when needed. There are ties to keep the cover attached to the frame, plus you get rope and tie-down stakes for extra security. All-in-all, this is a great choice for your first greenhouse, or if you only need a greenhouse for occasional use while starting seedlings or protecting delicate potted plants.
Build the Side and Back Walls
Amstutz adds, “Control the greenhouse climate as to not limit photosynthetic activity or deplete concentration levels of carbon dioxide.” Make sure there is enough air circulation and to discourage mold, fungus, and mildew from forming. And finally, for larger greenhouses, add roof vents or circulation systems to keep your everything aerated. With the sill and siding finished, we started sheathing the rest of the greenhouse walls with polycarbonate sheets.
Miracle-Gro 4-ft L x 6-ft W x 7-ft H Translucent Greenhouse Kit
Once cutting the miters, we cut a 1/4-in.-deep kerf in the bottom of the sill about 1/2-in. This kerf will keep water from wicking backward and getting behind the siding. We marked the miters and set the back of the board on a shim to keep the beveled edge flat against the fence. We started by cutting a five-degree angle on the edge of a 2×4 with the table saw, then cut a miter at both ends to turn the sill around the corner.
It's very easy to assemble and disassemble this small greenhouse—you don't even need tools—so you can quickly assemble it at the start of winter, and then put it away during the more temperate months. The roof is slanted to help prevent the buildup of snow and increase the ability of the structure to withstand winds. However, note that this is not intended for very heavy snow loads or winds over 30 mph. The manufacturer states that you can improve the greenhouse's wind resistance by sealing all panels with a silicone caulk.
Be aware that you'll need at least one and preferably two assistants to assemble the greenhouse, and it will take quite a few hours. However, once you have it assembled, you'll enjoy this beautiful, permanent greenhouse that can help you take your gardening to the next level. Emily Estep is a plant biologist and journalist who has worked for a variety of online news and media outlets, writing about and editing topics including environmental science and houseplants.
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Constructed from a series of semi-circular hoops, the hoop house is an easy-to-construct structure. You attach the ends of the hoops to base plates or stick them into the ground, and they automatically form the supports for the walls and roof. Cut the pieces of polycarbonate to overhang the fascia by about 1-1/2-in.
Significant inputs of heat and light may be required, particularly with winter production of warm-weather vegetables. The most weather-resistant structures have double-wall polycarbonate panels, which add to the cost of the greenhouse but also are the most effective at maintaining interior warmth when outside temperatures dip to freezing. Our best for cold climates pick, the Yardistry Meridian Double-Wall Greenhouse, is one such option. A cold-frame greenhouse is an enclosed structure that protects your delicate outdoor plants during winter months. Rubber gaskets around the doors and windows seal out the weather and keep humidity inside. You can even run a small heater in the greenhouse during the winter to provide plenty of warmth for delicate greenery or for growing vegetables and herbs any time of year.
The plants grown in greenhouses fall into several broad categories based on their temperature requirements during nighttime hours. In a cool greenhouse, the nighttime temperature falls to about 7–10 °C (45–50 °F). Among the plants suited to cool greenhouses are azaleas, cinerarias, cyclamens, carnations, fuchsias, geraniums, sweet peas, snapdragons, and a variety of bulbous plants including daffodils, irises, tulips, hyacinths, and narcissi. Begonias, gloxinias, African violets, chrysanthemums, orchids, roses, coleuses, and many kinds of ferns and cacti and other succulents are suited to such temperatures. In a tropical greenhouse, or hothouse, which has nighttime temperatures of 16–21 °C (60–70 °F), caladiums, philodendrons, gardenias, poinsettias, bougainvilleas, passionflowers, and many kinds of palms and orchids can be grown. In countries with cool climates, commercial greenhouses are used to grow tomatoes and other warm-weather vegetables.
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