Optimal environmental conditions for cannabis vary by growth stage to maximize health, prevent mold, and optimize development, with temperature in Fahrenheit and RH as relative humidity percentages.
Mother Plants
Mother plants, kept in perpetual vegetative state for cloning, thrive in stable, warm conditions mimicking veg.
- Temperature: 72-82°F (day), slightly cooler at night.
- RH: 55-70% to support vigorous growth without excess moisture.
Clones/Propagation
Fresh cuttings lack roots and rely on high humidity for transpiration until rooting, typically 7-14 days.
- Temperature: 75-85°F to encourage callusing and root initiation.
- RH: 80-95%, often using domes; gradually reduce to 70% post-rooting.
Vegetative Stage
Veg plants focus on foliage and structure, preferring warmth and moderate-high humidity for fast growth.
- Temperature: 70-85°F (lights on), 65-75°F (lights off).
- RH: 60-75% to support transpiration without stretching or damping off.
Flowering Stage
Flower demands lower humidity to prevent bud rot and cooler temps for resin, terpenes, and color.