Climate Controlled Plant Growth Chamber

A climate-controlled plant growth chamber (also called a plant growth chamber or phytotron) is an enclosed, insulated cabinet or room that precisely simulates and regulates environmental conditions to support plant growth, research, or propagation. It isolates plants from external weather, seasons, or contaminants, enabling reproducible experiments or optimized cultivation year-round.

Key Parameters Controlled

These chambers typically manage multiple interconnected variables:

• Temperature: Usually 10–50°C (or wider ranges), with tight uniformity (±0.5°C or better) using refrigeration, heating elements, and fans. Hot gas bypass or “refrigeration on demand” systems improve efficiency and prevent temperature spikes.
• Humidity (Relative Humidity – RH): Ranges from 10–90%+ RH, controlled via humidifiers, dehumidifiers, and sensors. Important for preventing desiccation or fungal issues.
• Lighting: Programmable photoperiods (day/night cycles) with intensities often 0–1000+ µmol/m²/s PPFD. Modern chambers use energy-efficient LEDs (full-spectrum, customizable spectra for different growth stages) instead of older fluorescent lamps. Lights are positioned for uniform coverage.
• CO₂ Levels: Ambient (~400 ppm) up to 1000–5000+ ppm for enhanced photosynthesis. Added via CO₂ injection systems with sensors.
• Airflow & Ventilation: Gentle, uniform horizontal or vertical air circulation to avoid hotspots, ensure gas exchange, and control humidity without excessive drying.
• Other features (optional): Irrigation/nutrient delivery, VPD (vapor pressure deficit) calculation, data logging, alarms, and programmable schedules for day/night or stress testing.

Advanced control systems (often PID-based or touchscreen) allow ramping, scheduling, and remote monitoring. Sensors feed data to actuators for real-time adjustments.

Types of Chambers

• Reach-in / Benchtop: Smaller units (e.g., 100–600+ liters) for labs, fitting on benches or stacking. Good for small experiments or seedlings.
• Walk-in / Rooms: Larger (thousands of liters or entire rooms/shipping containers) for bigger plants or higher throughput.
• Specialized: With specific lighting, insect rearing capabilities, or high-light intensities.

Common Applications

• Plant physiology and genetics research
• Seed germination and seedling propagation
• Crop improvement and phenotyping
• Pharmaceutical or secondary metabolite production
• Education and tissue culture
• Off-season or controlled horticulture (e.g., hemp, vegetables, model plants like Arabidopsis

They provide advantages over greenhouses by eliminating variability from weather, pests, or day length.