At that point their need is for air, and the air stone oxygenates the solution. As the air pump operates at 4 watts, it is a very economical system. They operate twenty four hours, seven days a week for pennies. Air Farms operate for less than a penny a day. The plants require less care, watering, and worry than their dirt bound cousins.
Weather is no longer a factor, disease, insect and animal pests are less likely.
The plants are easily portable and yield greater amounts in smaller spaces. Imagine having fresh tomatoes, peas and beans in the dead of winter. All of this in 3 sq. For planting annuals or perennials, the Air Farms work beautifully without the cages. This is an indoor system, and as such, your vegetable crops will continue to yield beyond their outdoor seasons.