Nutrient Burn in Cannabis
Nutrient burn in cannabis (often called nute burn) happens when a plant receives more nutrients than it can safely absorb. Excess salts build up around the roots, disrupting water uptake and damaging leaf tissue. This condition is common in beginners but can affect any grower if feeding strength, frequency, or runoff is ignored.
What Is Nutrient Burn in Weed?
Nutrient burn occurs when nutrient concentrations are too high for the plant’s current growth stage. Unlike deficiencies, nutrient burn typically shows up first on the tips of upper leaves, where excess nutrients accumulate.
Nutrient burn can happen in soil, coco, and hydro systems, and it’s often caused by overfeeding rather than a single heavy feeding.
Cannabis Nutrient Burn Symptoms
Common signs of nute burn include:
- Brown or burnt leaf tips (“burnt tips”)
- Leaf edges may turn yellow, rust-colored, or crispy
- Very dark green leaves
- Leaf clawing or downward curl
- Slowed growth despite heavy feeding
- Salt crust or residue on soil surface or pot edges
Key identifier: burnt tips on otherwise green leaves, especially near the top of the plant.
What Causes Nutrient Burn in Cannabis?
Nutrient burn in weed is usually caused by:
- Overfeeding nutrients
- Feeding too frequently without runoff
- High EC or PPM levels
- Salt buildup in the root zone
- Mixing multiple nutrient products incorrectly
- Using full-strength nutrients on young plants or autoflowers
Autoflowers are especially sensitive and often require lighter feeding than photoperiod plants.
How to Fix Nutrient Burn in Cannabis
If nutrient burn is mild:
- Reduce nutrient strength immediately
- Resume feeding at 50–75% strength
- Increase runoff to prevent salt buildup
If nutrient burn is moderate to severe:
- Flush the medium with pH-balanced water
- Measure runoff EC/PPM if possible
- Allow proper dry-back before re-feeding
- Resume with a lighter nutrient schedule
⚠️ Burnt leaf tips will not recover — focus on new growth health, not damaged leaves.
Nutrient Burn vs Nitrogen Toxicity
These issues are related but not identical:
| Nutrient Burn | Nitrogen Toxicity |
|---|---|
| Burnt leaf tips | Dark green, clawed leaves |
| Salt buildup | Excess nitrogen specifically |
| Can affect any nutrient | Mostly nitrogen-related |
| Often from high EC | Often from aggressive veg feeding |
Can Nutrient Burn Kill a Cannabis Plant?
Mild nutrient burn rarely kills plants. Severe or prolonged nutrient burn can:
- Lock out other nutrients
- Damage root systems
- Reduce yields significantly
- Stress plants into hermaphroditism
Early correction usually leads to full recovery.
How to Prevent Nutrient Burn
- Start with lower nutrient strength and increase gradually
- Feed to runoff regularly
- Monitor EC/PPM and pH
- Avoid stacking too many additives
- Follow lighter schedules for autoflowers
- Flush periodically to reset the root zone
Quick Summary
- Nutrient burn is caused by overfeeding
- Burnt tips are the earliest and clearest sign
- Upper leaves are affected first
- Damage is permanent, but plants can recover
- Prevention is easier than correction