Feminized Seeds Light Cycle (How to Get it Right)

Growing feminized marijuana seeds requires some planning and attention to detail. The right balance of light and dark is essential to ensuring your plants thrive and produce high-quality buds.

Cannabis seedlings that are sprouting in seed bags

In this article, we will delve into the importance of the light cycle and provide guidance on how to manage it for the best results.

Best Light Cycle for Feminized Seeds

The light cycle is crucial for the growth and development of your feminized seeds. During the vegetative stage, you’ll want to provide at least 18 hours of light per day. Some growers even opt for a 24-hour light cycle, but most prefer 18 hours to give the plants some rest.

Once your plants have spent at least three weeks in the vegetative stage, it’s time to transition to the flowering stage. To do this, switch the light cycle to a 12 hours on, 12 hours off schedule. This change will signal to your plants that it’s time to start producing those delicious, resinous buds.

Managing the light cycle properly can make a big difference in the overall success of your feminized cannabis plants. By understanding the nuances of their growth stages and adapting the light accordingly, you can ensure optimal conditions for your plants to flourish.

Related: The number of seeds you will need to grow weed

What Are Feminized Seeds

Feminized seeds are a type of cannabis seeds that have been specifically bred to produce female plants. This is important because female plants are the ones that produce the resinous buds that you’re interested in.

By growing feminized seeds, you can save time and space in your garden and avoid the hassle of having to identify and remove male plants.

These seeds are created by stressing a healthy female plant, usually through a method called silver thiosulphate solution treatment. This results in the plant producing pollen which, when used to pollinate another female plant, will produce seeds that are nearly 100% female.

Understanding Light Cycles


Photoperiodism refers to the response of plants to the duration of light and dark periods in their environment. As a grower, it’s essential to understand how your cannabis plants react to different light cycles. The right light cycle can positively impact your feminized seeds’ vegetative growth and flowering stages.

Natural vs Artificial Light

Cannabis plants can grow under both natural and artificial light sources. Depending on your growing method, you might opt for one or the other.

  • Natural light: Outdoor cannabis plants rely on natural sunlight. The quality and duration of sunlight varies depending on the season and geographical location. In an ideal setup, your plants would receive direct sunlight for most of the day. However, weather conditions and shady spots can limit sunlight exposure. So, monitoring and adjusting the plant’s position is essential for optimal growth.
  • Artificial light: For indoor cannabis cultivation, artificial lights such as LED or high-intensity discharge (HID) lamps are commonly used. These setups give you more control over the light exposure, allowing you to tailor the light cycle according to the growth stages. Make sure to invest in quality lighting equipment and a reliable timer to automate the process.

Feminized Seeds Light Cycle

Vegetative Stage

During the vegetative stage, you should provide your feminized cannabis plants with plenty of light to ensure healthy growth. This stage typically involves at least 18 hours of light per day, although some growers prefer to go as high as 24 hours a day for enhanced growth.

By providing sufficient light at this stage, you’re helping your plants grow strong and robust before they enter the flowering stage. Remember, it’s essential to give your plants at least three weeks in the vegetative stage before changing the light cycle to allow them to grow strong and healthy.

Flowering Stage

When it’s time for your feminized cannabis plants to enter the flowering stage, the light cycle should be adjusted to 12 hours of light and 12 hours of darkness. This transition helps mimic the natural light cycle changes that happen in nature as the seasons shift. By providing this updated light schedule for your cannabis plants, you’re aiding them in the crucial process of producing buds and eventually, fully developed flowers.

By carefully managing your feminized seeds’ light cycle during both the vegetative and flowering stages, you can ensure a successful and fruitful cannabis harvest. Keep in mind the importance of maintaining consistency in the lighting hours, as improper light exposure might lead to reduced yields or potential crop failure.

Related: How long you can store your marijuana seeds

Benefits of Proper Light Cycle

Helps Plants Grow Bigger and Stronger

This sturdy growth allows them to support heavy buds during the flowering stage, leading to increased yield. Furthermore, providing the right amount of light during the vegetative stage helps prevent stretching, ensuring that your plants remain a manageable size.

Energy Consumption

Besides promoting growth, sticking to the recommended light cycles also helps manage your plants’ energy consumption. With a proper light schedule, your plants can efficiently absorb the nutrients they need to thrive, while reducing any waste or unnecessary resource use.

In summary, following the suggested light cycles for feminized seeds can have multiple benefits, including:

  • Improved plant growth and strength
  • Increased yield during the flowering stage
  • Efficient use of energy and nutrients

Remember to monitor and adjust your light cycles as your plants progress through their life stages, and you’ll be on your way to a fruitful cannabis harvest.

Common Light Cycle Issues

Light Leaks

One issue you might face when maintaining a light cycle for your feminized cannabis seeds is light leaks. Even the smallest amount of unexpected light during the dark period can cause stress or confuse your plants, potentially leading to a delay in flowering or other developmental issues.

As a preventive measure, make sure to inspect your growing space for any potential light leaks, and fix them immediately. Cover windows and cracks, and keep in mind that even tiny sources of light, like electronic screens or indicator lights, can impact your cannabis plants.

Inconsistent Schedules

Another common problem in managing light cycles is inconsistent schedules. Imagine if you suddenly had to change your sleep schedule every day — it would make life much harder, right? The same goes for your cannabis plants. Their growth and development rely heavily on a stable light schedule.

To avoid inconsistency, use a timer for your lights, ensuring that they turn on and off at the same time each day. If you must access your plants during the dark cycle, use a green LED light, as it won’t disrupt their sensitive cycle. This way, you can keep your plants on track and help them thrive.

Adjusting Light Cycles for Feminized Seeds

If ever needed, you can also revert plants from the flowering stage back to the vegetative stage. To do this, simply change the lighting schedule from the 12/12 light cycle to 24 hours on for about 10 days. Afterward, go back to your preferred vegetative lighting schedule.

In summary, here are the light cycles to remember for feminized cannabis seeds:

  • Vegetative stage: 18/6 or 24/0 light cycle
  • Flowering stage: 12/12 light cycle

By following these guidelines, you’ll ensure that your feminized seeds grow healthy and produce the desired outcome. Happy growing!

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