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Visual library

Troubleshooting: the complete image library

Spot it, name it, fix it — visual diagnosis for sick plants and post-harvest problems. Every image below is a real teaching asset from the troubleshooting guides — grouped by topic, captioned, and linked to the article it lives on. Click any image to view it full size.

Nutrient & pH symptoms

Yellowing, spotting, lockout — what the leaf is telling you.

Early-stage nitrogen deficiency on a cannabis plant: the lowest, oldest fan leaves just beginning to pale and yellow.
Early Nitrogen Deficiency Used on cannabis nutrient deficiencies
Nitrogen-deficient cannabis fan leaf yellowing from the bottom of the plant upward, the classic sign of low nitrogen.
Nitrogen Deficiency Cannabis Leaf Used on beginner mistakes small space grows
Moderate nitrogen deficiency: lower cannabis fan leaves turning solid yellow and the fade climbing up the plant.
Moderate Nitrogen Deficiency Used on cannabis nutrient deficiencies
Severe nitrogen deficiency: lower cannabis leaves yellowed, browning, and dying off while the fade pushes high up the plant.
Severe Nitrogen Deficiency Used on cannabis nutrient deficiencies
Cannabis nutrient deficiency chart mapping leaf symptoms — yellowing, spotting, and discoloration — to nitrogen, magnesium, calcium, and potassium causes.
Cannabis Nutrient Deficiency Leaf Chart Used on beginner mistakes small space grows
Light, heat & water stress

Burn, taco-leaf, droop versus wilt — environmental damage.

Comparison of an overwatered cannabis plant with drooping, curled-down leaves beside an underwatered plant with thin, wilting leaves.
Overwatered vs Underwatered Cannabis Used on why growth is slow in a compact setup
Root & reservoir problems

Root rot and DWC failures, healthy versus failing roots.

Early root rot in a DWC reservoir: cannabis roots showing the first off-white to tan discoloration against still-healthy white roots.
Early Root Rot Used on root problems in dwc
Moderate root rot: cannabis roots turning brown and slimy through much of the root mass in a DWC reservoir.
Moderate Root Rot Used on root problems in dwc
Severe root rot: cannabis roots collapsed into brown, slimy strands with widespread decay in the reservoir.
Severe Root Rot Used on root problems in dwc
Comparison of harmless nutrient or pH staining on cannabis roots versus true brown, slimy root rot.
Root Rot vs Brown Staining Used on root problems in dwc
Side-by-side comparison of healthy white cannabis roots versus brown, slimy root rot in a DWC reservoir.
Root Rot vs Healthy Roots Used on root problems in dwc
Pests, mold & mildew

Powdery mildew, bud rot, and pest damage — the safety set.

Early bud rot inside a cannabis cola: the first grey-brown fuzz and a single wilted leaf deep in the bud.
Early Bud Rot Used on bud rot and mold
A cannabis cola broken open to reveal grey-brown bud rot decaying the bud from the inside out.
Bud Rot Inside a Cannabis Cola Used on beginner mistakes small space grows
Moderate bud rot: grey-brown rot hollowing out a noticeable section of a cannabis cola from the inside.
Moderate Bud Rot Used on bud rot and mold
Severe bud rot: a cannabis cola largely consumed by grey-brown, dusty botrytis decay.
Severe Bud Rot Used on bud rot and mold
Comparison of a healthy dense cannabis cola beside one infected with grey-brown bud rot.
Bud Rot vs Healthy Cola Used on bud rot and mold
Early powdery mildew: the first faint white powdery spots appearing on a cannabis fan leaf.
Early Powdery Mildew Used on bud rot and mold
White, dusty powdery mildew spreading across the surface of a cannabis fan leaf.
Powdery Mildew on a Cannabis Leaf Used on beginner mistakes small space grows
Moderate powdery mildew: white powdery patches spreading across several cannabis fan leaves.
Moderate Powdery Mildew Used on bud rot and mold
Severe powdery mildew: cannabis leaves and bud sites coated in a white powdery fungus.
Severe Powdery Mildew Used on bud rot and mold