Why Cannabis Plants Prematurely Flower After Transplanting Outside From Inside & How To Prevent It

3 years ago
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Hey everyone! I wanted to post a quick education commentary explaining why cannabis plants that are transplanted outside can start to pre-flower prematurely. When you move a marijuana plant from indoors to outdoors, sometimes those plants will go into flower early which can drastically reduce your harvest. In this video I talk about why this can happen, how to prevent this issue from arising in your outdoor garden, as well as some things you can do after you notice this start to impart your weed plants.

This gardening issue is caused by your plants getting confused by indoor lighting schedule. Something about your indoor lighting is causing your plants to go into transplant shock. Usually growers will start their indoor grow on an 18/6 lighting schedule. In order to avoid shocking their hemp plants, most growers attempt to slowly lower the amount of lighting over time as it gets closer to transplanting time. This is actually the opposite of what you want to do and this practice can actually confuse the plant into prematurely flowering.

Cannabis is annual plant that lives for one grow season. Cannabis plants depend on the lighting schedule or orient themselves and understand whether it's time to veg out or whether it's time to flower. In the spring, the days slowly get longer and longer until the summer solstice. After that day, the days slowly get shorter and shorter. In, the spring, plants realize there is time to grow bigger and produce more flower sites, but as the days get shorter, the plants realize that the end of the season is drawing near.

When days are getting shorter and the daily daylight falls below a certain range, your plant will invest all it's energy into flowering. This is because it knows the grow season is ending so it desperately produces pistils in an attempt to get pollinated and produce seeds so that it's genetics and survive the winter and grow next season thus continuing the cycle.When growers slowly lower the amount of light in their tents, they are telling the plant the grow season is ending and that the plants better flower and push out pistils to collect pollen and reproduce before it's too late.

If you want to prevent your plant from getting confused, prematurely flowering, and stunting your plant, then you need to maintain your lighting schedule or even increase your the amount of time your lights are on as you get close to transplanting time. Just be careful not to have more daylight in your tent than there is outside when your plan on transplanting.When you increase the "daylight", you're telling your plant that the days are getting longer and that there is plenty of time to continue it's vegetative growth. Every strain has a different daylight threshold that will trigger it to flower (ie. Sativas will typically flower sooner and longer while Indicas start flowering later and for less time).

To be safe, Google a daylight or sunlight calendar for your area, look up your target transplant date and see how much daylight you're expected to have around then. Run as close to that amount of daylight as you can (maybe 15-30 minutes less) so when you transplant, your cannabis plant will clearly recognize that the days are getting longer so it will continue its vegetative growth rather than go into shock and flower early. A good rule of thumb is to give more than 14 hours of growth but not more than 17. I usually stick with around 15 hours on all throughout my vegetative growth indoors and that works for me, but your local environment may be different so adjust based on where you live.

If you notice your plants are prematurely flowering and you want to them to revert back to vegetative growth, is there anything you can do? The answer is yes and no. If you notice this issue very early on before your plant has time to completly go into flower, then you may be able to reverse it with minimal stress to your plant. The key is to identify the pre-flower very early on. If you wait a week or more than it may be too late avoid stunted plants. If you wait a week or more, then there is a good chance that the hormones in your plant have changed and it will likely take you about 6 weeks to see your cannabis plant reveg.

f you catch the issue early, then I recommend supplementing your marijuana plant with extra light in the evenings for about an extra hour or two each day, feeding with a high nitrogen fertilizer, and cutting off some lower nodes to force the plant to invest energy in new growth. Hopefully this helps, but the key is to prevent the issue in the first place. It will be very difficult to overcome this issue unless you are very proactive and identify it early.

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