Experimental drying and curing comparisons, moisture redistribution, cannabinoid measurements, color, and microbial levels.
Harvest & Post-Harvest
Drying: Temperature, RH & Airflow
Drying rate is governed by moisture gradients, surrounding vapor pressure, temperature, tissue structure, and air movement; direct high-velocity airflow can overdry surfaces while interiors remain wetter.
Key concepts
- Water moves from wetter internal tissue toward the surface
- Air temperature and RH determine vapor-pressure conditions around the flower
- Air movement reduces the local boundary layer but too much direct airflow can create uneven drying
- Dense flowers can retain internal moisture longer than their surface suggests
What to measure or observe
- Measure room temperature and RH at representative locations
- Check airflow distribution rather than one fan setting
- Track mass or other consistent drying indicators over time
- Inspect for condensation, odor changes, or mold
Common mistakes
- Pointing strong fans directly at flowers
- Relying on one room sensor
- Assuming a dry-feeling exterior means moisture is uniform internally
Visuals this lesson still needs
- Flower moisture-gradient cutaway
- Room airflow map
- Boundary-layer diagram
- Surface-versus-interior drying comparison
Evidence & further reading
Sources connected to this lesson
These references support specific biological, diagnostic, environmental, or process concepts used in this lesson. They are not a substitute for crop-specific testing or local regulatory guidance.Cannabis inflorescence microbial loads, microclimate, airflow, handling, drying method, moisture, water activity, and post-harvest risk factors.
Drying, curing, storage, water activity, equilibrium moisture, packaging, and post-harvest process design.