THC Living Plant Atlas · Production Module
Leaves connect plant function, visible symptoms, environment, pest inspection, measurements, and Grow Doc diagnostics. This hub now links each lesson to its printable field tools.
A leaf symptom is evidence, not proof. Yellowing, browning, spots, curling, wilting, burnt tips, or pest marks must be interpreted with plant stage, symptom location, environment, root-zone readings, recent changes, and direct inspection.
The first five field tools are now routed under Atlas Downloads and ready to connect into lessons and Grow Doc prompts.
Lesson system
Fan leaf structure, veins, petiole, upper/lower surface, leaflets, serrations, and healthy baseline references.
processLight, carbon dioxide, water, chlorophyll, sugars, and growth without implying more light is always better.
processGuard cells, CO2 entry, water vapor exit, VPD, transpiration, and leaf temperature.
processWater movement from roots through xylem and out of leaves as vapor, driven by leaf-air demand.
diagnosticYellowing by old/new growth, uniform/interveinal pattern, margins, speed, pH, EC, and root-zone context.
diagnosticDead tissue patterns: burnt tips, brown margins, spots, blotches, dry crispy tissue, and spreading lesions.
diagnosticTacoing, canoeing, clawing, drooping, twisting, and cupping with timing and canopy location.
diagnosticNutrient-like symptoms with pH, EC, feed history, root health, watering, and environment.
IPMStippling, webbing, eggs, frass, trails, silvering, chewing, distorted tips, undersides, and nodes.
environmentLeaf posture, color, texture, growth rate, and damage location tied to light, heat, humidity, VPD, and airflow.
Leaf appearance reflects root supply, vascular transport, light, temperature, humidity, gas exchange, nutrition, pests, pathogens, and developmental stage. Use the connected tools before assigning a single cause.