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Why Darkness is Essential for Cannabis Plants
Cannabis is among the plants that are sensitive to light conditions during their flowering phase. The two main genera of cannabis, Indica and Sativa, are short-day bloomers. This means they begin to flower when the daylight duration falls below 12 hours. This adaptation allows the plants to optimally time their flowering to the seasons.
The Problem of Nighttime Light Pollution
During the flowering phase, even brief nighttime light pollution can significantly affect the plants. If the dark phase is interrupted for more than a few minutes, the plant mistakenly interprets this as the start of a new day. Repeated interruptions of the dark phase can greatly delay flowering and even cause the plant to hermaphrodite, producing both male and female flowers, which can impact the quality and quantity of the harvest.
During the growth phase, the occurrence of stray light is less problematic, as the plants are primarily gaining size and leaf mass and are not dependent on specific light cycles for flowering. However, it is also advisable during this phase to maintain a natural light cycle to minimize stress for the plants.
What About the Third Cannabis Genus?
Cannabis Ruderalis is the northern light among cannabis genera, originally from Russia. Adapted to the short summers and long-day periods of the northern latitudes, Ruderalis flowers independently of day length. This is also where the term "autoflowering" is derived from.
Understanding the different light needs of cannabis genera is crucial for successful cultivation and optimal harvest results. Proper management of light conditions, especially ensuring sufficient dark phases, is essential for the health and productivity of the plants.
Fun Facts:
Hermaphroditism in cannabis can produce both male and female flowers on the same plant.
Red nighttime light pollution can cause issues even more quickly during the flowering phase. Residents of St. Pauli, be warned.
Light pollution can also be a problem for outdoor cannabis cultivation in urban areas.
Indica and Sativa have their roots in geographical regions with vastly different light conditions.
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