Light Deprivation in Horticulture

Since the early 20th Century, light deprivation in horticultural applications have been studied. It was discovered that the amount of natural light plays a vital role in the growth of plants. There are two main types of plants, long-day plants and short-day plants. Short-day plants flower naturally when the nights are long. They sense dark hours instead of light hours. When sensors in your plants’ leaves indicate that in each 24-hour cycle, 12 hours or more of sustained, uninterrupted darkness your plants’ apical meristems (growing tips) will shift priorities. Instead of producing more leaves and stems, the plant will produce a more floral structure. Examples of short-day species include chrysanthemums, poinsettias, rice, some varieties of marigolds, orchids, strawberries, and cannabis.

Photoperiodism is the response of an organism to seasonal changes in day length. This is precisely why light deprivation systems work for short-day plants. A grower can control the length of light and dark hours and mimic season changes. It’s a very cost-effective way to get more harvests out of each year. Using light deprivation will also allow the grower to introduce crops and flowers in the off season, giving them a competitive advantage in the marketplace.

J&D Manufacturing has light deprivation solutions for your greenhouse. Our newest WM Light Dep Exhaust Fan comes with the light trap. All performance data associated with this fan includes the light trap – meaning easy ventilation calculations for the grower. No estimations are needed! We also provide light traps that are easy to assemble and install so a grower can easily retrofit their current greenhouse fans as part of a light deprivation greenhouse system. For more information, contact your local J&D Dealer, or J&D directly. Take the first step to enjoying your new light deprivation greenhouse system today!