What is 12/12 when growing Cannabis?

12/12 is shorthand for “twelve hours of light and twelve hours of darkness”. This means to have your grow lights turned on for 12 straight hours, then off for the next 12 hours.

Why use 12/12 when growing Cannabis?

The 12/12 light schedule lets cannabis plants know that it is now time to make buds/flowers instead of growing leaves and stems. It’s important that cannabis plants get no light during their “dark period”.

Changing your light cycle to 12/12 or 12 hours on – 12 hours off is what triggers your plants to start and maintain the flowering stage of growth. This is the plants natural way of understanding and changing with the season as their life will be coming to an an end and it is time to reproduce. The female buds are what is desired from cannabis and those buds cannot be produced outside of the 12/12 light cycle unless the plants are of rederalis or autoflowering lineage.

Similar Terms

  1. Full cycle
  2. Harvest time
  3. Flowering stage
  4. Budding phase
  5. Maturity period
1. What is 12/12 in terms of cannabis cultivation? 12/12 refers to the light cycle used during the flowering stage of cannabis cultivation. It means that the plants are exposed to 12 hours of light and 12 hours of darkness each day. 2. Why is 12/12 important for cannabis plants? The 12/12 light cycle is important for cannabis plants because it signals the plant to start producing flowers. During the vegetative stage, cannabis plants require more light to grow and develop, but during the flowering stage, they need a shorter light cycle to trigger the production of buds. 3. How long should I keep my cannabis plants on a 12/12 light cycle? The length of time that cannabis plants should be kept on a 12/12 light cycle depends on the strain and the desired outcome. Generally, the flowering stage lasts between 8-12 weeks, but some strains may require longer or shorter periods. It’s important to monitor the plants closely and adjust the light cycle as needed to ensure optimal growth and yield.