Cannabis Leaf Symptoms

Use our cannabis leaf symptoms pictures to quickly diagnose your marijuana plants. Find the pictures that resemble your plants and click on them to learn the solution to your cannabis problem or nutrient deficiency!

Yellow Leaves And Discoloring

The yellowing of cannabis leaves is the most common symptom that growers see in their plants. Yellowing can even be normal in certain situations, but can be lethal in others. Better be safe than sorry. Find your yellowing and learn what to do about it.

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Nitrogen deficiency begins with the loss of color in the tip of the leaf. This loss of color will begin to move inward, leaving the leaf completely pale. The leaf will then start to brown and wrinkle, until it finally falls off the plant.

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Oldest fan leaves begin to take on a strong yellow hue on the edges and tips, and/or these start to get “burned,” chances are you’re facing a potassium deficiency.

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Yellow spots on the edges or between the veins of its older leaves, while the veins themselves remain dark green. The leaves may show spots of necrosis (brown spots), and the most affected ones will fold over themselves and die.

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Yellowing of the leaves most noticeable in new shoots. Leaves will begin to discolor completely and will go through the plant as the iron deficiency becomes more severe.

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Leaves first turn yellow, then progressively develop brown patches, and eventually die. If left untreated, the deficiency could destroy the entire plant.

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The initial symptom of a sulfur deficiency begins as a slight yellowing of the mid-section leaves, which becomes more pronounced in yellowing and then takes on the whole leaf.

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Early signs of zinc deficiency occur at the newest growth zones, generally at the top. Shoot tips will wrinkle up close together. Leaves will begin to yellow from the veins out.

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Light burn usually causes yellow leaves at the top of the plant directly under the grow lights (though it can appear on older leaves that have been exposed for a long time).

Dark Or Brown Leaves

The reason for brown spots and burned tips/edges in cannabis is harder to identify because they look very similar. Please pay attention to details and check for other symptoms that accompany it.

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Old leaves begin to take on a strong yellow hue between the veins or the tips and edges start to get “burned,” chances are you’re facing a potassium deficiency.

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First shows on the large, older leaves at the bottom of your plant. The symptoms manifest in leaves that turn dark green and in many cases, get brownish or blueish patches.

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Calcium deficiency most often shows up in newer growth and parts of fan leaves that are most exposed to light. Difficult to diagnose since it’s are often accompanied by other deficiencies.

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Telltale signs of nitrogen toxicity is too dark green leaves, as well as a claw like look. But flowering plants might have enough energy to use the nitrogen hence producing smaller buds.

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Tips of fan leaves begin to curl upward and also exhibit a generally dry and withered look. Leaves will develop large brown spots in irregular shapes along the edges and tips.

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The yellow or brown leaf tips are caused by too-high levels of nutrients at the roots, which disrupts the flow of water through the plant and causes the symptom of burnt tips on leaves.

Other Symptoms And Markings

Other symptoms in cannabis plants are mostly related to pests, mold or diseases. Sadly, there are a bunch of organisisms that like to eat on our plants, luckily tho, there are ways to prevent and stop them.

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There are three ways bud rot (botrytis) shows. You might see: parts of buds turning dark or discoloring; yellow leaves coming out of buds; web-like mold on on top of the buds.

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Leaves first show patterns of tiny spots or stipplings. They may change color, and even curl and fall off. Spider mites activity is visible in the small webs under leaves and along stems.

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Thrips rasp the leaf tissue, look out for stains showing up on the surface of the leaves, with a slight silvery sheen. As well as some small black dots that are the thrips feces.

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Santiago Pardo
Santiago Pardo
I live to help out cannabis growers have a greater experience with their crop, and not lose their mind over the many aspects of growing marijuana.

7 replies on “Quickly Diagnose Cannabis Leaf Symptoms”

Hi, I seem to be having a problem that o have not seen as common. My plants are extremely slow growing and all new leaves start turning pale/pink white and then die. I have flushed and ensured I gave nutrients. Any ideas?

Rust Fungus is an odd topic, but I just got some pics of the weirdest rusty/moldish growths on my White Widow’s. I cut those mothers off, doused em’ in Neem Oil right before the lights went out, and now praying for the best. I’m bringing this up entirely because I think it could be helpful to you and your quest to help the cannabros/cannababes:
It spread like wildfire. The red flag showing me that it wasn’t nute problems was the fact that it had spread from lower, older leaves to young and seemingly healthy new growths. Sure, everyone’s grow environments are different, but this particular event was an indoor grow, mylar tent, correct to the T fresh air exchange, with a low RH of 45%, and temperatures staying between 77 and 82 degrees Fahrenheit.
My theory on how the growths started is that when my lights go off, I do so timely with my bed time. That being said; I cannot truly check where the RH% and Temp lie in the middle of the night. It has been storming quite frequently where I live, and I believe my RH% has been sky rocketing over night. That fluctuation of Low/High Temps and Humidity may have caused this form of fungus to grow, but all I have are pictures of my own, and the occasional post on how Rust Fungus hasn’t been scientificly proven to spread to Cannabis.
If you have any info on this, please let me know as quickly as possible! My girls lost a lot of foliage today and if there’s a round two I want to have a ballpark guess on how to fight back!

Hey Joshua, so sorry to hear that. I haven’t faced or investigated rust fungus. But I can see there’s a lot of information online just searching “rust fungus”. I pray your plants will recover!

Rinse your plant Thoroughly. Ensure your pH is right.
1/Rinse your soil.
2/PH all your water before watering.
3/Do not use excess nutrients.
4/Make sure you’re using a fan.
5/If possible, keep your humidity levels relatively low.
6/(I use) Neem oil with a touch of vinegar to correct my pest and fungal problems.
Spoonful of Neem oil and a spoonful of vinegar to a quart of water, shake vigorously before using.

Then most likely the problem is in the roots. Check the pH of the growing medium. If soil, also check pH of the runoff water. Also check symptoms of root rot and excess salts

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