VPD Chart

Cannabis grow room tool

Interactive VPD Chart

1.10kPa
LowTargetHigh

Drag on the chart to triangulate temperature, RH, and VPD.

Stage bands: clone 0.4-0.8, veg 0.8-1.1, flower 1.0-1.3, late flower 1.2-1.5 kPa.

Values are grow-planning references, not plant-health guarantees. Watch cultivar behavior, airflow, substrate moisture, and disease pressure.