Marijuana Horticulture Theindooroutc
ken. Plastics and fiberglass can provide safe, economical alternatives.
Plastic is much cheaper than glass (a sixth to a tenth of the cost), can be heated as effectively as glass, and is equal to glass in producing quality plants and buds. Polyethylene (PE) is low cost, lightweight, provides ample light, and can withstand fall, winter, and spring weather. It does not tolerate summer UV levels, however, and must be replaced annually. Ultra-violet inhibited PE lasts longer, but both types lose heat more quickly than glass. During the day, this can help keep plants cooler, but at night the heat loss requires the use of an artificial heat source. Poly Weave'" is a plastic fabric made of 8-mil polyethylene reinforced with nylon mesh. It transmits up to 90% sunlight, can be sewn or taped, and has a lifespan of up to five years.
Polyvinyl chloride (PVC) is two to five times more expensive than PE but can last five years or longer. Polyvinylchloride is pliable, transparent or translucent, and comes in four to six foot (1.2-1.8 m) widths which can be sealed together to provide a super-wide piece. Ultraviolet inhibited corrugated plastic panels provide another option. The panels can be used in cold frames, propagation houses, and greenhouses to provide excellent wind and snow protection and optimal solar heat collection. UV inhibited corrugated plastic also has insulating properties (2.5 R insulation/3.5 mm panels, 3.0 R/5.0 mm panels).
Corrugated fiberglass is lightweight, strong, and comes in eight to twelve foot (2.4-3.6 m) panels. Poor grades will discolor, reducing light penetration, but a good grade of clear fiberglass can cost as much or more than glass. Its lower weight is an advantage, and it is more difficult to see through!
Lexan™ h ttp:// www. ge plastics, com/ gelexan/ is a thermoplastic that lasts for years and transmits almost as much light as glass while retaining heat. Clear panels like
The long 12-hour nights induce visible signs of flowering in about two weeks. These plants have been flowering for almost a month.
This backyard greenhouse near Paris, France was recently planted.
Two months after planting, the grower used black plastic to induce flowering with a 12/12 day/night photoperiod.
those in glass or Lexan,M may require shading during the heat of the day. Again, there are a number of options. You may select a roll-up shade of wood or aluminum, or a shading compound that is painted onto the outside of the glass. Vinyl plastic is a flexible film that installs easily against wet glass inside the structure and is reusable.
Framework and covering are only the beginning, Growing plants in a greenhouse is often more demanding than growing plants indoors, Air | Big strong buds are a few weeks from harvest. temperature, humidity, light, and air quality must all be controlled in relation to a constantly changing greenhouse climate.
Continue reading here: Climate Control
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