Plant Doctor – Diagnose Your Plants!

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 5-Step Remedy to 99% of Cannabis Growing Problems​​

Click here to see ALL cannabis plant problems on one page

An accidental revegging of cannabis causes unusual new growth and smooth leaf edges

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 ...
Read More
Cannabis plants with aphids have pale or dark bugs under the leaves, typically with white specks (baby aphids and their exoskeletons)


Aphids are soft-bodied insects which can appear white, green, yellow, black, brown and red, depending on their stage of life and ...
Read More
Barnacle scale insects look like unmoving growths on your cannabis stems and leaves

Barnacle Scales

These unusual bugs hang out on your stems and under your leaves without moving. Scale insects suck the life out ...
Read More
A cannabis boron deficiency causes brown patches on leaves and causes thick, twisted or abnormal new growth.

Boron Deficiency

A boron deficiency in cannabis is relatively rare unless a plant is underwatered or in a really dry environment, and ...
Read More
When broad mites attack cannabis they cause droop or twisted new growth, especially near the top of the plant, along with blistered and glossy looking leaves

Broad Mites

Broad mites on your cannabis plants are so tiny they are practically impossible to spot with the naked eye, and can ...
Read More
Bud Rot on cannabis causes dying leaves to appear on the buds, and upon investigation you'll be able to see mold at the base of the leaves

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 ...
Read More
A calcium deficiency in cannabis causes brown spots on the leaves

Calcium Deficiency

Calcium is an important nutrient which helps provide structure to the cannabis plant and helps it withstand stress like from ...
Read More
Caterpillars and inch worms can leave holes in your cannabis leaves

Caterpillars & Inchworms

Sometimes the first sign of caterpillars / worms / cabbage loopers is just seeing chunks of your leaves missing. You may also see ...
Read More
Example of a copper deficiency on a cannabis plant. The leaves turn dark, almost shiny looking, and edges and tips of leaves turn yellow

Copper Deficiency

A cannabis copper deficiency appears with leaf symptoms such as dark leaves that take on blue or even purple undertones. The ...
Read More
Crickets don't infest cannabis often, but they can chew small holes in your leaves, and mole crickets can tunnel under your plants


Crickets will happily eat your cannabis plants and leave small holes in your leaves. Mole crickets may be found digging around ...
Read More
Fungus gnats looks like tiny flies buzzing around the soil, and are typically triggered by wet soil conditions

Fungus Gnats

A fungus gnat is so small it's thinner than the width of a quarter. They commonly appear when cannabis plants ...
Read More
Example of grasshopper damage on a cannabis leaf


Grasshoppers (and sometimes locusts, which are basically just grasshoppers with wings) will happily eat your cannabis leaves, leaving holes, and live ...
Read More
Heat stress causes cannabis leaves to start cupping (turn into "canoes"). Another symptoms is leaves pointing up

Heat Stress

Your cannabis plant can only withstand a certain amount of heat and light. After a certain point, your cannabis will ...
Read More
Hemp russet mites on cannabis symptoms (yellow mass of bugs, tops of plants droop)

Hemp Russet Mites

Hemp russet mites are tiny bugs that attack cannabis plants. In fact, they are so small you can only see ...
Read More
Male plants, hermies and bananas are not good. The first sign is "bananas" or "balls" where buds should be

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 ...
Read More
A cannabis iron deficiency causes the top and inner leaves to turn yellow or white

Iron Deficiency

A cannabis iron deficiency is usually seen first on bright yellow new leaves, and the symptoms of a cannabis iron deficiency ...
Read More
Cannabis leaf damage from a leaf miner looks like a pale trail on the leaf

Leaf Miners

The term "leaf miner" is a common name for a type of pest actually lives inside the tissue of the leaf. These ...
Read More
Leaf septoria on cannabis plants causes round yellow or brown spots on leaves

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 ...
Read More
Leafhopper damage on a cannabis leaf (appears as brown spots in clusters)


These pests will happily munch on your leaves, leaving brown or yellow spots. They can sometimes spread certain plant diseases ...
Read More
Light burn or light stress on cannabis plants causes the leaves or tips of leaves to turn yellow. The worst symptoms are usually closest to the grow light.

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 ...
Read More
The lower and older leaves start turning yellow between the veins when a cannabis plant gets a magnesium deficiency

Magnesium Deficiency

A light green or yellow coloring will begin to show on the veins and edges of the lower & older ...
Read More
Manganese deficiency symptoms on a cannabis plant

Manganese Deficiency

Leaves may become yellow in between the veins, with mottled brown spots on the affected leaves. These brown dead patches ...
Read More
These mealybugs look like white hairy bugs on your cannabis, leaving white patches that look like mold or webbing


These white and hairy bugs enjoy warm temperatures and don't tolerate the cold. They have even been known to grow and spread ...
Read More
A cannabis molybdenum deficiency causes red or pink coloring on the leaves

Molybdenum Deficiency

he initial symptoms may appear similar to a nitrogen deficiency (yellowing of older, lower leaves). Leaves may become mottled or ...
Read More
Example of a nitrogen deficiency (the lower cannabis leaves turn yellow and fall off)

Nitrogen Deficiency

A cannabis nitrogen deficiency will cause the older, lower leaves on your plant to turn yellow, wilt away and eventually ...
Read More
Example of a cannabis plant with a nitrogen toxicity (dark green leaves with the tips turned down)

Nitrogen Toxicity

Dark green leaves, shiny leaves, clawing, weak stems, and overall slow growth. Marijuana leaves that are nitrogen toxic often get ...
Read More
Burnt leaf tips as the results of cannabis nutrient burn

Nutrient Burn

Nutrient burn or fertilizer burn is one of the most common beginner cannabis growing problems. The yellow or brown leaf ...
Read More
Signs of an over-watered cannabis plant includes droopiness and wilting


After watering, your plants start drooping. Usually the droopy leaves will feel firm and appear curled down (the whole leaf ...
Read More
PH fluctuations can cause brown spots on middle or lower leaves

pH Fluctuations

Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH ...
Read More
Example of a phosphorus deficiency on a cannabis plant (leaves get dark splotches and eventually drop)

Phosphorus Deficiency

A cannabis phosphorus deficiency generally appears on leaves from the lower/older parts of the plant. The lower leaves may turn ...
Read More
Planthoppers are common cannabis pests - main symptom is white fuzzy patches, bugs take many forms


by Nebula Haze Planthoppers can attack and infest cannabis, leaving a unique cotton-like growth while they suck the life out ...
Read More
A potassium deficiency in cannabis causes burnt leaf tips and edges, as well as yellowing between the margins

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 ...
Read More
Root problems in cannabis can cause a variety of symptoms, which can look like almost anything

Root Problems

Cannabis plants with root problems show many symptoms. They may appear overwatered or droopy, leaves curl or cup, wilted, slow ...
Read More
Root Rot

Root Rot

Slimy, brown, twisted or unhealthy roots are caused by unwanted pathogens in your hydroponic tank! Curled, drooping, unhealthy leaves are ...
Read More
Slugs and snail damage on cannabis leaves looks like a bunch of bites were taken out of the leaf (which is what happened) often accompanied by a trail of slime

Slugs or Snails

Although not the most common cannabis pest, slugs and snails are unwelcome visitors when they do show up! Sure signs ...
Read More
Spider mites on cannabis cause spots on the leaves. You'll also start to see webbing and tiny bugs if you look closely

Spider Mites

Spider mites are part of the mite family and are related to spiders, ticks, and other mites. Although they’re a ...
Read More
Young stink bugs massing on eggs that were laid on cannabis leaves

Stink Bug

Various species of stink bug have been known to attack cannabis plants. They lay distinctive patches of white eggs, which ...
Read More
A sulphur deficiency in cannabis plants causes leaves to turn yellow (starting from the back of the leaf)

Sulfur Deficiency

A sulfur deficiency is relatively rare and will manifest itself as all-over chlorosis (yellowing of leaves), usually starting with the ...
Read More
Thrip damage on cannabis leaves


Thrips are small, fast-moving insects and can come in many forms, from pale wormy looking things to dark or golden ...
Read More
Tobacco mosaic virus gives cannabis plants odd yellow markings and twisted growth

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 ...
Read More
Under watered cannabis plants wilt or droop, and the leaves become limp and lifeless


If your plant is drooping, then it’s usually a sign of either over or under-watering. Leaves often seem “papery” and ...
Read More
WPM causes white powdery patches on leaves or stems that may resemble flour

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 ...
Read More


White flies look like tiny white moths when they're flying around and otherwise behave a bit like spider mites; hanging ...
Read More
Wind burn causes curled or clawing leaves in the direct flow from a fan

Wind Burn

Most indoor cannabis growers use fans to blow air around within the grow area. This creates a nice breezy environment that ...
Read More
Zinc deficiency on cannabis plants cause the top leaves to turn yellow

Zinc Deficiency

With a cannabis zinc deficiency, younger leaves start yellowing in between the veins. Leaf tips get discolored and start dying ...
Read More
Return to Top of Page