Light Burn on Marijuana Plants

Hi there and welcome (back) to Free the Tree!
Today we decided to finally cover Light Burn issues on Cannabis. This issue can occur pretty easily if your leaves are too saturated in light.

This issue can easily be confused with others, such as Nitrogen Deficiency, since the symptoms are pretty similar. But don’t worry, we’ll give you all the details needed 😉

Exposed section of the leaf fully turned white

What Is Light Burn?

Light burn happens when the light source is too close or intense for the leaves “burning” the chlorophyll buds away, rendering the leaf useless.
This is also one of the reasons why you see the leaf turn white.

How to spot Light Burn on Cannabis?

As most ways of spotting deficiencies with Cannabis the symptoms show on the leaves.
In this case you’ll see the leaves the most exposed to the light start to turn yellow, then white before dying out. Generally it will show at the top of the plant but not necessarily, it’s really of question of light exposure.

What are the symptoms of Light Burn?

  • Symptoms start to show on the leaves closest to the light or the most exposed ones.
  • At first the leaves start to turn yellow, which can be confused with Nitrogen Deficiency.
  • Only most exposed sections are affected.
  • After this the leaf will turn totally white and possibly browning tips.
  • Even if the leaf is fully affected by the light burn, they will not fall easily (big difference with Nitrogen Deficiency)
  • Your leaves will not recover from the symptoms.

I know that it be kind of hard to picture this in words so here’s the evolution in image
As always, you can click on the images to get the full view.

Evolution of Light Burn

Tip of leaf starting to turn yellow/white

Early Signs of Burn

Leaf whitening and tip turning brown

Tip of the leaf turning white

Exposed section of the leaf fully turned white

Exposed section of the leaf fully white

How to fix Light Burn issues on Marijuana?

Removing light stresses on your plants is pretty forward.
Generally the main reason for light burn is linked to the fact that the light source is way too close to the tip of the plants.

This means that the fix is simple, bring your lights up further from the top of your plants. If you can’t do so try to reduce the intensity of the light by switching to a lower intensity light bulb.

Most Common Reasons for Light Burn

Generally there are 2 reasons for light burn:

  • The lights are way to close to the top of the top of your plants.
  • The intensity of your light bulbs in too strong for the plants, thus saturating the leaves.

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