Visual reference slot
Needed asset: Transpiration Root-to-Leaf Flow showing roots, xylem, leaf vapor exit, VPD pull, and stress boundaries.
Field checklist
- Check droop, curl, edge stress, and canopy position.
- Compare before watering, after watering, and peak light period.
- Inspect whether roots/media can supply the leaf demand.
Measurements to pair
- Substrate moisture, irrigation volume, dryback.
- VPD, temperature, RH, airflow.
- EC/pH and leaf temperature if available.
Common mistakes
- Calling every droop overwatering.
- Ignoring high VPD water demand.
- Changing feed when the root zone is the limiting factor.
Grow Doc prompt
Evaluate transpiration balance: root-zone moisture, VPD, PPFD, airflow, leaf posture, irrigation timing, dryback, EC/pH, and symptom progression.