Seedlings: 0.4 – 0.8 kPa
Vegetative Stage: 0.8 – 1.2 kPa
Flowering Stage: 1.2 – 1.6 kPa
High temperature + low humidity → High VPD
Low temperature + high humidity → Low VPD
VPD chart for indoor Plants
Ignoring VPD completely
Using fixed humidity values
Not adjusting for plant stage
Poor ventilation