Clawing Cannabis Leaves
When cannabis leaves curl tip-down into a claw shape, you're usually overfeeding nitrogen. Sometimes it's overwatering.
What it looks like
- ●Leaf tips curl DOWN into a claw
- ●Leaves are dark green, almost black
- ●Affects upper leaves first
Quick diagnostic checks
Measure before you treat
Plant diagnostic essentials
These tools help confirm the cause of clawing leaves before you change nutrients, watering, or the environment.
VIVOSUN pH and TDS Meter Combo
Check root-zone pH and nutrient strength before changing a feeding plan.
Check price on AmazonGovee Bluetooth Hygrometer
Track temperature and humidity trends instead of guessing from one reading.
Check price on AmazonFoxFarm Liquid Nutrient Trio
A complete, staged nutrient system for vegetative growth and flowering.
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Causes ranked by likelihood
1. Nitrogen toxicity
Most commonSigns
- ●Leaves dark green-to-black
- ●High-N feed recently
- ●Veg-strength nutes into flower
Fix
- ✓Flush with 3x pot volume of pH'd plain water
- ✓Switch to lower-N bloom nutes
- ✓Wait for new growth to come in lighter green
2. Overwatering
CommonSigns
- ●Soil wet
- ●Pot heavy
- ●Leaves droopy AND clawing
Fix
- ✓Let soil dry completely
- ✓Lift test before watering
⚠️When to worry
Clawing in flower is bad — it's eating into yield. Fix within a few days.
Gear that prevents this problem
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