Views: 0 Author: Site Editor Publish Time: 2026-05-07 Origin: Site
As a professional supplier of temperature and humidity control systems, understanding the precise growth parameters of crops is key to providing customers with the best solutions. Below are the optimal environmental control data for hemp at various growth stages in indoor cultivation.
Hemp's environmental requirements vary significantly at different growth stages. The core challenge is finding a balance between maintaining comfortable leaf transpiration (measured by VPD value) and preventing mold growth.
Growth Stage | Recommended Temperature (Day/Night) | Recommended Relative Humidity (RH) | Professional Control Points (VPD/Ventilation) |
Seedling / Cloning | Day 25-26°C / Night 20-22°C | 65% - 80% | High humidity promotes rooting: Roots are weak at this stage. Higher humidity (approx. 75-80%) reduces leaf transpiration stress and prevents wilting. |
Vegetative | Day 22-28°C / Night 18-22°C | 55% - 70% | Rapid growth: Plant metabolism is high. Maintaining moderate humidity promotes photosynthesis and stem/leaf growth. |
Flowering | Day 20-26°C / Night 18-21°C | 40% - 55% | Critical mold prevention period: Humidity must be gradually reduced (as low as 40% in late flowering) to prevent botrytis (gray mold) and powdery mildew from attacking dense buds. |
Harvest / Drying | 18-23°C (constant) | 50% - 55% | Slow dehydration: In a dark, cool environment with gentle air circulation to preserve flavor and potency. |
Our temperature and humidity control system not only stably controls the temperature within ±1℃, but more importantly, it precisely locks in humidity according to different growth stages (e.g., 45% RH is required during flowering). Furthermore, we have built-in VPD (vapor pressure difference) calculation logic to help you adjust the environment to the plant's most comfortable 'breathing rhythm,' resulting in faster, stronger growth and preventing mold.
