THC Atlas Field Card

Leaf Diagnostic Field Card

Use this card to document what you actually see before deciding what caused the issue. Observation comes first; diagnosis comes after pattern, measurements, pest inspection, root-zone context, and recent changes.

Print / Save PDF Open Leaf Module

Visual reference slot

High-quality visual needed

Healthy vs stressed leaf observation panel

Final artwork should show a healthy fan leaf baseline, symptom position examples, old/new growth cues, upper/lower canopy location, and close-up leaf detail. Use clean academic styling, accurate cannabis morphology, readable labels, and no yellow tint.

Field checklist

Check whether the symptom starts on old growth, new growth, or the whole plant.
Check whether it appears in the upper canopy, lower canopy, one branch, or multiple plants.
Describe the symptom first: yellowing, browning, spotting, curling, drooping, twisting, or pest evidence.
Inspect undersides of leaves and nearby nodes for pests, eggs, webbing, or frass.
Record environment and root-zone context before correcting anything.

Rule: a leaf symptom is evidence, not proof.

Measurements to pair

PPFDDLIVPDtemperatureRHleaf temperaturepHECsubstrate moisture

Grow Doc prompt

I am using the Leaf Diagnostic Field Card. The symptom starts on [old/new] growth, appears in the [upper/lower] canopy, looks like [yellowing/browning/spots/curling], and current readings are [PPFD, temperature, RH, VPD, pH, EC, substrate moisture]. Help narrow likely causes and what to verify next.