Jul 092014
 July 9, 2014

Marijuana is a sun-loving plant and will easily grow to large heights if provided with enough solar contact. But since marijuana is also a durable and resilient plant, growers have been able to successfully obtain buds from marijuana plants grown with only a skylight.

Sunlight encourages leaf and stem production, which in turn enables the cannabis plant to retain more sunlight, ultimately leading to more growth, larger yield and better weed. If your cannabis plants don’t receive adequate sunlight, no amount of soil and water preparation will compensate for this crucial deficiency.  Download my free marijuana grow bible for more tips about growing marijuana plants outdoors.

While light is necessary for growth, it is darkness that actually triggers flowering in mature marijuana plants. Once a mature plant receives a certain minimum amount of uninterrupted darkness for a week or so, this signals to the plant that the growing season has ended. The mature marijuana plant will begin to convert its energy from growing to flowering. This is why it is best to grow your marijuana plants as early in the spring as possible so that they receive the maximum amount of light, and can therefore spend most of their life cycle growing.

It is best to try and plant in a spot where your marijuana plants will receive sunlight for the longest possible period of time. Midway through the growing season, when the days are longest, the sun can be shining for 12 or more hours a day. Your goal is to find a location such as a clearing, free of trees or other obstacles that could prevent your plant’s leaves from capturing the sun’s rays and using them to power growth.

South-facing sites are usually the best in the northern hemisphere and vice versa for those in the southern hemisphere. This may not be possible for everyone due to other concerns like security or perhaps access to water. In that case make sure your cannabis plant receives at least five hours of direct sunlight and five hours of indirect sunlight each day. If you must choose between morning sun and afternoon sun then the consensus is that morning sun is best for growth.

Some northern marijuana growers experience a different problem: darkness plays a large factor in northern regions. Since the nights are short, the marijuana plants may not have enough time to flower before autumn sets in and, with it, the first frost. For these growers, being able to simulate a longer night to trigger flowering may be necessary. In this case a greenhouse or other enclosure may be the only way to grow outside. Please note that the darkness must be total as any light the marijuana plants receive, even if only briefly, will stall flowering and restart vegetative growth. LED lights are a good option to use in greenhouses or other enclosures. You can find some below:

 

Cannabis growers near the equator or in other southerly places with long periods of darkness (more than ten hours for consecutive nights) may find that their cannabis plants flower too soon. This is a lot easier to deal with since shining light is always easier than withholding.

Either way, it is important to remember that light, because it is important to both the vegetative growth and flowering stages, should be looked at from the perspective of the plant’s entire life cycle. One of the great advantages to growing outdoors is that, providing that you have picked a great spot for the cannabis plants, the sun and changing seasons should do the rest.

Besides light, water, temperature and fertilizers the genetics of the marijuana seeds are very important. Bad genetics can never produce high quality marijuana. If you want to start growing, download my free grow guide and order some marijuana seeds. All top quality marijuana seeds are available in my marijuana seed shop. We ship seeds to the US, CA and many other countries. For any growing related question please visit the marijuana support page.

Source: ILoveGrowingMarijuana.Com

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About Robert Bergman

Robert Bergman is a master marijuana grower. Robert Bergman is the author of 'Marijuana Plant Care' and 'The Marijuana Grow Bible'.
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  22 Responses to “How Much Light Do Outdoor Marijuana Plants Need?”

  1.  

    What exactly are the signs that outdoor plants should be removed from sunlight and when they are should it be to total darkness? I have two female plants (THC Bomb) that are about 13 weeks old and are in what I’ll call the pre-flowering stage, still growing but show tiny buds emerging. I obviously don’t want to remove sunlight too soon, but don’t want to continue vegging too long.

    Also, I want to produce seeds on just one branch (pollen is in storage and the male plant has been dispatched; single male flowered much faster) but don’t know how to coordinate harvesting the seeds in conjunction with the smokable parts. I take it that the seeds need much longer to mature into high quality. Is it possible to strip off the non-seeding branches for drying and leave the seeding one on the plant? Any other suggestions?

    •  

      Nature will flip the plants are the days get shorter, just make sure there is no light available to the plants at night, this will cause Hermaphrodites, Place the pollen in a white garbage bag and place it over the branch you want to pollinate and secure it where the branch starts at the main trunk with a rubber band. Do this in the evening so heat is not a factor that could kill the branch you select. Shake the bag and leave it on until morning. Remove the bag carefully and discard it. Within a week you should see the seeds start to form. After several days you can rinse the branch with water stop prevent the spread of pollen, use a small sprayer like windex comes in. This breeding will result in several phenotypes, you will have to grow these out to see which one you like best. Happy Harvest

      •  

        Ron, sorry I forgot to address your last question, the plant should finish at the same time, squeeze a couple of seeds out of the branch you pollinated and check them, make sure they are fully formed with hard casings and brown colored, crack them open and the inside should be ready. I would pollinate several weeks after the buds have grown a bit. When the plant is close to finish flush it for the last week to avoid a harsh product. If you need to leave the seeded branch longer you could give just enough fertilizer to see it through to insure mature seeds. I would get the marijuana horticulture indoor/outdoor bible by Jorge Cervantes, its a must have for this kind of info, you can get it as a digital download at http://mobi-read.com/?p=115827. Good luck

      •  

        Ron, sorry I forgot to address your last question, the plant should finish at the same time, squeeze a couple of seeds out of the branch you pollinated and check them, make sure they are fully formed with hard casings and brown colored, crack them open and the inside should be ready. I would pollinate several weeks after the buds have grown a bit. When the plant is close to finish flush it for the last week to avoid a harsh product. If you need to leave the seeded branch longer you could give just enough fertilizer to see it through to insure mature seeds. I would get the marijuana horticulture indoor/outdoor bible by Jorge Cervantes, its a must have for this kind of info, you can get it as a digital download or order the paperback, I would buy the paperback, its a must have . Good luck

        •  

          Thanks for all the good information. I plan to wait a few weeks before pollinating as you suggested. An idea that might appeal to you is to tie a colored string at the bottom of the pollinated branch for identification.

          •  

            That is a good idea, i have used those colored fuzzy pipe cleaners or a ribbon, you will be able to see the pollenated branch when the seeds have formed. A small hand magnifier is great to have, you can check the trichomes are harvest gets close. Happy Harvest

  2.  

    Great article!

  3.  

    I need some help plz . Light burn my second 2 leaves . Can i cut thèm ?

  4.  

    Help

  5.  

    This is my plant . 15 days . Burn light

  6.  

    Marijuana close light burn leaves . Solution ?

  7.  

  8.  

    First time grower . I have 15 granddaddy purps growing outdoors
    All budding hard and nicely. Question is one is different as it’s buds are a lot more red and dense. Not sure what’s going on with it. They look good but maybe not as crystally . Slight deformation maybe smaller denser bugs. ANY HELP OR IDEA’S

  9.  

    This didint help at all….. fuck you!

  10.  

    What about us here in Florida? Still as much sun as possible? It gets 90 by 9 am most days. Is that to much???

  11.  

    How about 4 hours per day

  12.  

    I live in California how much sunlight does my plants need I’m a first time grower.

  13.  

    Hi guys I’m in the uk and the weather is on and off but I want to put
    my lemon kush outside and wondered if there is any suggestions please

  14.  

    My plant is Turing yellow all so no buds seem to b forming an every time I put it in son light it looks like it’s dieing what do I do

  15.  

    I have 2 small plants 1has buds the other doesn’t.they were started late in the season.im a first time grower.lol no idea what I’m doing.they are outside plants.live in Canada.the weather here right is in the high 70s mid 80s.how do I make big buds lol

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