Light Burn On Marijuana Plants

June 8, 2021

There is only so much light your marijuana plant can take. At some point, the plant will show evidence of strain around the main points where it receives light. Brown or yellow spots will show up on the leaves, followed by burnt tips and the borders will remain green.

In the spots where it’s getting an excess of light, the leaves will look burnt. Learn how to identify and prevent light burn on your marijuana plants.

Light burn on cannabis

Download my free grow bible to learn more about light burn on marijuana plants.

Calling light-bleached marijuana names such as “white cannabis” or “albino cannabis” is not a good thing. The fact that it is white is a sign that it is in bad condition. This is not what you want.

How to fix light burn

How to fix light burned cannabis leaves

If you think the plants are getting more light than is necessary, start by sliding the grow light farther from the top of the plants.

Light bleaching because of sunlight is very rare when outdoor growing and there is no way they will ever get too close to the sun. If you move your plants from a bad situation, then into the sun they may display signs of light bleaching if they never had a chance to adjust to the increase in light.

Take it slow when adjusting your plant’s conditions. You don’t want to stress your plant out for either outdoor or indoor growing.

Maintain a cozy temperature consistently for the best results and health. Think about it like this, if you feel like it’s too hot, then certainly it’s too hot for the plants. Things aren’t as simple for outdoor growing, but take the time to learn what to do for outdoor heat.

Marijuana plant symptoms

Cannabis plant symptoms light burned leaves

Leaf symptoms

  • Tips/Edges are burnt or brown
  • Leaves turn pale in color
  • Brown spots
  • Top leaves / new growth is damaged
  • Veins of leaves remain green

Plants with strong genetics are less vulnerable to environmental stresses, diseases, nutrient deficiencies and pests. Make sure to buy marijuana seeds from a trusted seed bank.

Buy Marijuana Seeds

FAQs About Cannabis Light Burn

What are some common symptoms of light burn on weed?

If you notice that the tips/edges of your plant’s leaves are burnt or brown or pale and that new growth is damaged, your plant is most likely experiencing a light burn.

How do you prevent light burn on marijuana plants?

Always maintain a cozy temperature consistently for the best results and health of your plants.

Have you ever dealt with light burn on cannabis plants? Please leave comments or questions below.

Happy growing!


The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


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  1. By Marijuana Seedling Problems ,30 Jul 2015
    […] Heat Stress And Marijuana Plants Light Burn On Marijuana Plants […]
  2. By Andrew Franko ,30 Jul 2015
    I got five AK-48's. Two of the five didn't pop (so sad). One of the other three is looking good. The other two sprouted but are slow growers. They have very thin stems, is that normal? I started these on […]Read More
  3. By latewood ,31 Jul 2015
    Andrew, You have to be patient. I am not sure starting the seeds in Black Gold. That soil may be too hot for seedling, but you will find out shortly. If tips start to curl, and dry out, the soil […]Read More
  4. By trisha ,30 Aug 2015
    i have 2000 watts going in my grow room where should i set my aircondtioner at
  5. By latewood ,02 Sep 2015
    trisha, You adjust your AC to a setting you feel comfortable with. Ideally, you want you temps to be between 70-80f, or 20-25c. In order to get temperatures stable, you adjust the AC day by day, until you find the […]Read More
  6. By Tom ,23 Dec 2015
    How would the combination of a 400 watt H/P and a 1200 watt 10 watt split LED work for getting the best of thoes worlds be for my girls?? Buy the way great seeds.
  7. By Billy graham ,01 Dec 2016
    I bought 15 seeds, 5 of 3 different types, i planted 2 of each (6). All 6 started to grow. I thought this will be great. Im growing indoors in a fish tank. Foil insides to help with light, flouresant […]Read More
    1. By Roy ILGM ,02 Dec 2016
      Sorry to hear your grow didn't work out Billy. Maybe our experts on the support forum can help out!
  8. By Jared ,05 Dec 2016
    I have one that is light burned. Used a R30 65watt flood grow bulb and a 15watt florescent black light. I recently just purchased a 15watt florescent plant and aquarium bulb. I now run the F15 all day and turn […]Read More
    1. By latewood.ILGM ,05 Dec 2016
      Jared, Never run lights all day. 19 hours a day max. I jhave no idea what type lights you have so I cannot advise you. I will say that flood lights are generally not suited to growing, but you said […]Read More
  9. By 4rth grow ,23 Sep 2017
    myplants are 4 weeks ihto veg starterted showing burt tleaf tips then started curling .I Set the liights further back .immediaty started looking better but still worried about the clawing and twisting that took place. .will they be o.k now?
    1. By Newby ,31 Aug 2018
      my light rig has failed at 106 days, was beginning to flush for a harvest date of 91318; I cannot get another rig for 36 hours. Should I harvest now?
  10. By Marcia ,15 May 2021
    My seedlings have turned white from the inside of the leaves these last few days. I did take them outside from my sun porch where they had been growing. It also turned cold and I brought them in at night.

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