“What is VPD? 🌱💧”
Vapor Pressure Deficit (VPD) drives plant transpiration:
• Low VPD: High humidity, mold risk.
• High VPD: Low humidity, stress risk.
• Optimal: 0.8-1.5 kPa (veg), 1.2-1.8 kPa (flower).

Balance VPD = Healthy plants.

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