Problem diagnosis
Most grow problems fall into a few categories: nutrients, water, pH, environment, or pests. Match the symptom before changing your feed schedule.
Quick triage
- • Check pH of runoff before adding nutrients
- • Lift the pot — weight tells you more than the calendar
- • Inspect undersides of leaves for pests with a loupe
- • Compare upper vs lower leaf symptoms — location matters
Why Are My Cannabis Leaves Turning Yellow?
Diagnose yellowing leaves by growth stage, pattern, and location on the plant — nitrogen deficiency isn't always the culprit.
Nutrient Burn: How to Identify and Fix It
Burnt leaf tips, dark green leaves, and crispy edges — learn to recognize overfeeding before it stunts your plants.
Overwatering vs Underwatering Cannabis
Drooping, clawed leaves, slow growth — learn to tell too much water from too little and fix your watering rhythm.
Spider Mites and Common Cannabis Pests
Webbing, speckled leaves, flying gnats — identify indoor pests early and stop an infestation before it spreads through the tent.
Light Burn and Heat Stress on Cannabis
Bleached bud tips, upward-cupping leaves, and foxtailing — diagnose when your light or tent temperature is too much for the canopy.
pH Lockout: Diagnose and Fix Nutrient Lockout
Nutrients in the pot but leaves still yellow? When pH drifts, roots can't uptake — here's how to test runoff and fix it fast.
Bud Rot and Mold in Cannabis
Gray fuzz inside colas, wet spots, hay smell — catch botrytis early in late flower before it spreads through the canopy.
Calcium and Magnesium Deficiency in Cannabis
Yellow between the veins, rusty spots, weak new growth — fix cal-mag issues and pH before your buds suffer.
Root Rot: Signs and Recovery
Brown slimy roots, sour smell, sudden wilt — save plants from Pythium and anaerobic root zones before they collapse.