Nutrient Toxicity Field Guide

Possible excess pattern / 06

Iron

Dark or bronzed newest growth with fine spotting warrants a whole-environment review rather than a single-cause conclusion.

May show first

Newest growth.

Growlytics iron toxicity chart showing a healthy leaf reference and possible early dark or bronzed new foliage, progressing fine spotting, and late stunted mottled growth.
This supplied field chart includes a healthy reference and possible early, progression, and late-stage cues. Use it to compare patterns, not to confirm a diagnosis.

Pattern cues

Compare the stages with healthy growth.

Healthy reference

Compare newer foliage across the canopy and account for light exposure and root-zone context before drawing conclusions.

Early

Very dark new foliage or bronzed speckling may show under stressed conditions.

Progression

Fine spotting and irregular discoloration can overlap with light or pH stress.

Late stage

Stunted new growth with mottling and multiple micronutrient-like signals may follow.

Not the same as deficiency

Similar symptoms can point in different directions.

Deficiency guides describe patterns associated with limited availability. This toxicity guide records possible excess-pattern cues. Either pattern can resemble the other when uptake or growing conditions are disrupted.

Check before acting

Look beyond the leaf.

These signals can overlap with nutrient lockout, pH or EC imbalance, watering and root-zone conditions, light or heat stress, and broader environmental factors. Use the pattern as an observation prompt, not a diagnosis or a treatment instruction.

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    Iron Toxicity Pattern Guide | Growlytics