悟る · diagnose & fix
Cannabis Nitrogen Toxicity
Nutrient toxicity · also: nitrogen excess, the claw, dark green clawing leaves
Too much nitrogen turns leaves dark green and glossy with tips that curl down like a claw.
Not sure it's nitrogen toxicity?
Snap a photo and get a free read — no signup. Satoru weighs the visual against the conditions that cause look-alikes, so you treat the real problem.
What it looks like
Leaves are an unnaturally DARK green, thick, and waxy/glossy. Tips bend sharply downward ("the claw"). Often paired with weak stems and delayed flowering.
Symptoms
- Very dark green, glossy leaves
- Leaf tips clawing/curling downward
- Brittle or weak stems
- Slow transition into flower
Causes
- Overfeeding nitrogen
- Running veg nutrients into flower
- Too-high overall nutrient strength (EC/PPM)
How to fix it
- 1Flush with pH'd plain water to dilute the root zone
- 2Resume at a lower feed strength, stage-appropriate
- 3Reduce or drop high-N veg nutrients once flowering
Prevention
- Feed to EC/PPM targets for the stage, not by guess
- Step nitrogen DOWN as the plant enters flower
悟る · how satoru tells it apart
Dark clawing leaves vs. crispy burnt tips are different problems with opposite fixes. Satoru cross-checks your feed log and EC so you don't flush when you should feed (or vice-versa).
Commonly confused with: Nutrient Burn, Nitrogen Deficiency.
Not sure it's nitrogen toxicity?
Snap a photo and get a free read — no signup. Satoru weighs the visual against the conditions that cause look-alikes, so you treat the real problem.
More plant problems
Educational reference for cultivation troubleshooting. Symptoms overlap — when in doubt, match against your own conditions. Satoru fuses your photo with your logged environment for a grounded read.