minimally water-stressed plants for use in drought or flood physiology experiments. Aeroponics is the ideal tool for the study of root morphology. The absence of aggregates offers researchers easy access to the entire, intact root structure without the damage that can be caused by removal of roots from soils or aggregates. It's been noted that aeroponics produces more normal root systems than hydroponics. Terminology Aeroponic growing refers to plants grown in an air culture that can develop and grow in a normal and natural manner. Aeroponic growth refers to growth achieved in an air culture. Aeroponic system refers to hardware and system components assembled to sustain plants in an air culture. Aeroponic greenhouse refers to a climate controlled glass or plastic structure with equipment to grow plants in air/mist environment. Aeroponic conditions refers to air culture environmental parameters for sustaining plant growth for a plant species. Aeroponic roots refers to a root system grown in an air culture. Types of aeroponics Low-pressure units In most low-pressure aeroponic gardens, the plant roots are suspended above a reservoir of nutrient solution or inside a channel connected to a reservoir. A low-pressure pump delivers nutrient solution via jets or by ultrasonic transducers, which then drips or drains back into the reservoir. As plants grow to maturity in these units they tend to have dry sections of the root systems, which prevent adequate nutrient uptake. These units, because of cost, lack features to purify the nutrient solution, and adequately remove incontinuities, debris, and unwanted pathogens. Such units are usually suitable for bench top growing and demonstrating the principles of aeroponics. High-pressure devices High-pressure aeroponic techniques, where the mist is generated by high-pressure pump(s), are typically used in the cultivation of high value crops and plant specimens that can offset the high setup costs associated with this method of horticulture. High-pressure aeroponics systems include technologies for air and water purification, nutrient sterilization, low-mass polymers and pressurized nutrient delivery systems. Commercial systems Commercial aeroponic systems consist of high-pressure device hardware and biological systems. The biological systems matrix includes enhancements for extended plant life and crop maturation. Biological subsystems and hardware components include effluent controls systems, disease prevention, pathogen resistance features, precision timing and nutrient solution pressurization, heating and cooling sensors, thermal control of solutions, efficient photon-flux light arrays, spectrum filtration spanning, fail-safe sensors and protection, reduced maintenance & labor saving features, and ergonomics and long-term reliability