Brown Edges on Cannabis Leaves
Brown, crispy edges on cannabis leaves usually mean potassium deficiency or nutrient burn — the pattern tells you which.
What it looks like
- ●Brown, dry edges around the perimeter of the leaf
- ●Yellowing between the brown edge and green interior
- ●Potassium def: starts on lower leaves
- ●Nute burn: worst on upper leaves
Quick diagnostic checks
Measure before you treat
Plant diagnostic essentials
These tools help confirm the cause of brown leaf edges 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 AmazonBotanicare Cal-Mag Plus
Useful when filtered water, coco, or a confirmed calcium-magnesium issue is involved.
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Causes ranked by likelihood
1. Potassium deficiency
Most commonSigns
- ●Brown edges with yellow halo
- ●Starts lower and spreads up
- ●Common in flower
Fix
- ✓Use a bloom formula higher in K (Tiger Bloom, FloraBloom)
- ✓Check pH — K locks out below 6.0
2. Salt/nutrient burn
CommonSigns
- ●Tips AND edges brown
- ●Upper leaves affected
- ●After strong feedings
Fix
- ✓Flush and reduce feed strength
⚠️When to worry
Potassium deficiency in flower cuts bud size. Fix within a week.
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