This is tricky because even the briefest amount of light will make plants start growing again and put off flowering. Therefore, it needs to be a complete, uninterrupted darkness. Marijuana plants are happiest when they get between 5-6 hours of direct sunlight per day.
1. Autoflowers do have a photoperiod, all plants do--Auto's just don't require a set amount of darkness to trigger a flowering response. These two statements are different from one another. 2. Books without data are fairly useless--but granted, all of those dudes did suggest a dark period is good. 3. The reason is not generally stress related.
Bigger canopies provide more bud sites, and therefore offer better yields. When you’re ready, you only need to do one thing: alter the light period. Set your timer to run a 12/12 light cycle that mimics late summer and early fall. This environmental shift will trick your plant and force them into reproductive mode.
The optimal light schedule is 18 hours of light and 6 hours of darkness for the entire life cycle of your autoflowering plants. You could keep your grow lights on for the entire duration of your plant’s life cycle, but this can get expensive. Autoflower Grow Guide: How to grow autoflowering strains week-by-week:
It makes setting the intensity and height of your lights so simple. From everything I’ve read optimal DLI for seedlings is 10-20, veg 20-40 and flower 40-65. You can run the lights at less intensity (lower PAR) for a longer period of time and get the same DLI as high intensity for a shorter time. DLI is a measure of total light over time.
Here's all you need to know to get started growing autoflower weed indoors. 1. Light. With no sun to rely on you'll need to provide light for your plants. There are many different lighting options to choose from, and knowing which one is best for you can be tricky. Fluorescent Make sure to dilute the nutrients well when you start feeding autoflowers to avoid burning and stunting the plants. For example, if the nutrient table recommends 5 ml/litre, it's best to start with 2.5 ml or 1.25 ml (1/2 or 1/4 strength) and see how the plant responds. A photodependant cultivar can be grown to the desired size before putting it into flower. Indoor plants can be kept in their vegetative phase until you decide to change the light schedule from 18 hours per day to 12 hours per day, or transplant outside. You do not have this same control with autoflowers. They flower regardless of whether they 6. Providing an Improper Light Schedule. At most high-quality seed shops, you can get autoflowering cannabis seeds and feminized photoperiod cannabis seeds. Autoflowering strains are relatively easy to grow, especially when it comes to lighting: You can just keep them under an 18–24-hour daily light schedule from the moment you plant your seeds up until harvest. Minor or micronutrients for autoflower plants. Magnesium (Mg): Used in many processes and a necessary element for chlorophyll. Calcium (Ca): Major component of plant cell walls. Sulfur (S): Needed for Nitrogen absorption, resilience, chlorophyll, and more.
Light is crucial for good growth. If you’re growing indoors, you can easily implement an 18/6 light routine with 18 hours of light followed by 6 hours of darkness. As autoflowers don’t depend on light to begin the flowering process, it’s important that you get this right from the beginning. Some growers have adopted 20/4 routines for

Most common light schedule for autoflowers – 18/6. ‘18’ refers to the hours the auto plant gets exposed to light, while the ‘6’ applies to the dark hours. This is the most prevalent light schedule for autoflowers among cannabis cultivators since it allows the plant to have a 6-hour rest after 18 hours of making dense and appealing buds.

Autoflowers can even grow with short light cycles of 12 hours on, 12 hours off, while this can significantly reduce electric costs, it will also come with a loss in yield. Another advantage of autoflowers is that they are not affected by light pollution; light pollution is when external light sources interrupt a cannabis plant’s dark cycle.
Now is the time to introduce a consistent lighting schedule. While autoflowering cannabis plants do not require a change in light schedule to start flowering, they still benefit from regular light exposure. A 16/8 lighting schedule (16 hours of light followed by 8 hours of darkness) is a good starting point. This simulates a long summer day and
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    • how many hours of light do autoflowers need