Use our cannabis growing problem pictures and interactive plant doctor tool to quickly diagnose your sick marijuana plants! Click the pictures below to learn about a marijuana problem, deficiency or symptom & get the solution! Still having trouble? Consult our 7-Step Remedy to 99% of Cannabis Growing Problems

Accidental Re-Vegging
"Re-veg" is short for "re-vegetation" and refers to what happens if a flowering plant stops flowering and re-enters the vegetative ...
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Barnacle Scales
These unusual bugs hang out on your stems and under your leaves without moving. Scale insects suck the life out ...
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Boron Deficiency
A boron deficiency in cannabis is relatively rare unless a plant is underwatered or in a really dry environment, and ...
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Broad Mites
Broad mites on your cannabis plants are so tiny they are practically impossible to spot with the naked eye, and can ...
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Bud Rot or Mold
Bud rot in cannabis plants is caused by mold, and is most likely to appear when buds are dense and the ...
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Calcium Deficiency
Calcium is an important nutrient which helps provide structure to the cannabis plant and helps it withstand stress like from ...
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Caterpillars & Inchworms
Sometimes the first sign of caterpillars / worms / cabbage loopers is just seeing chunks of your leaves missing. You may also see ...
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Copper Deficiency
A cannabis copper deficiency appears with leaf symptoms such as dark leaves that take on blue or even purple undertones. The ...
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Fungus Gnats
A fungus gnat is so small it's thinner than the width of a quarter. They commonly appear when cannabis plants ...
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Grasshoppers
Grasshoppers (and sometimes locusts, which are basically just grasshoppers with wings) will happily eat your cannabis leaves, leaving holes, and live ...
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Heat Stress
Your cannabis plant can only withstand a certain amount of heat and light. After a certain point, your cannabis will ...
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Hemp Russet Mites
Hemp russet mites are tiny bugs that attack cannabis plants. In fact, they are so small you can only see ...
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Hermies, Pollen Sacs & Bananas
Did you know there are “male” and “female” cannabis plants? Yes, cannabis plants are “dioecious” plants, which means each plant shows ...
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Iron Deficiency
A cannabis iron deficiency is usually seen first on bright yellow new leaves, and the symptoms of a cannabis iron deficiency ...
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Leaf Miners
The term "leaf miner" is a common name for a type of pest actually lives inside the tissue of the leaf. These ...
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Leaf Septoria / Yellow Leaf Spot
Sometimes called "yellow leaf spot" or "leaf septoria," this condition is caused by a fungus (or sometimes a bacteria) that attacks ...
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Leafhoppers
These pests will happily munch on your leaves, leaving brown or yellow spots. They can sometimes spread certain plant diseases ...
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Light Burn or Light Stress
Your cannabis plant can only withstand a certain amount of light. After a certain point, your cannabis will start turning ...
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Magnesium Deficiency
A light green or yellow coloring will begin to show on the veins and edges of the lower & older ...
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Manganese Deficiency
Leaves may become yellow in between the veins, with mottled brown spots on the affected leaves. These brown dead patches ...
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Molybdenum Deficiency
he initial symptoms may appear similar to a nitrogen deficiency (yellowing of older, lower leaves). Leaves may become mottled or ...
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Nitrogen Deficiency
A cannabis nitrogen deficiency will cause the older, lower leaves on your plant to turn yellow, wilt away and eventually ...
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Nitrogen Toxicity
Dark green leaves, shiny leaves, clawing, weak stems, and overall slow growth. Marijuana leaves that are nitrogen toxic often get ...
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Nutrient Burn
Nutrient burn or fertilizer burn is one of the most common beginner cannabis growing problems. The yellow or brown leaf ...
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Over-Watering
After watering, your plants start drooping. Usually the droopy leaves will feel firm and appear curled down (the whole leaf ...
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pH Fluctuations
Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH ...
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Phosphorus Deficiency
A cannabis phosphorus deficiency generally appears on leaves from the lower/older parts of the plant. The lower leaves may turn ...
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Planthoppers
by Nebula Haze Planthoppers can attack and infest cannabis, leaving a unique cotton-like growth while they suck the life out ...
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Potassium Deficiency
With a marijuana potassium deficiency, you'll generally see symptoms on older leaves, but not always. Sometimes you'll see the symptoms at the ...
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Root Problems
Cannabis plants with root problems show many symptoms. They may appear overwatered or droopy, leaves curl or cup, wilted, slow ...
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Slugs or Snails
Although not the most common cannabis pest, slugs and snails are unwelcome visitors when they do show up! Sure signs ...
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Spider Mites
Spider mites are part of the mite family and are related to spiders, ticks, and other mites. Although they’re a ...
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Sulfur Deficiency
A sulfur deficiency is relatively rare and will manifest itself as all-over chlorosis (yellowing of leaves), usually starting with the ...
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Tobacco Mosaic Virus (TMV)
Tobacco Mosaic Virus (TMV) is a virus that is commonly found in tobacco plants which causes splotchy or twisted leaves, strange mottling ...
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Under-watering
If your plant is drooping, then it’s usually a sign of either over or under-watering. Leaves often seem “papery” and ...
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White Powdery Mildew
White powdery mildew is usually a minor annoyance that's easily fixed, but if you don't catch it early, white powdery ...
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Whiteflies
White flies look like tiny white moths when they're flying around and otherwise behave a bit like spider mites; hanging ...
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Zinc Deficiency
With a cannabis zinc deficiency, younger leaves start yellowing in between the veins. Leaf tips get discolored and start dying ...
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