The Aerojet is Botanicare's Best Selling Expandable Hydrogarden The AEROJET is a true aeroponic system, not a deep flow hydro-aeroponic system. Microjets spray the roots of the plants allowing for aggressive growth rates due to the high levels of oxygen delivered to the root zone. The AEROJET is ideal for hobbyists as well as schools and research institutions, and is preferred by advanced growers as the method of choice in feed delivery methods.