Passive hydroponics is a convenient method for vegetable gardening because of its high yields and deliverance of quality products. In this technique, you have to fill a 5 gallon cooler/reservoir with water and then mix it with the desired amounts of hydroponic nutrients. Then pierce a hole in the center of a Styrofoam piece. Float the vegetable plants in the hydroponic nutrient medium and let the roots submerge through the Styrofoam. To avoid drowning, ensure that the plants do not sink too deep in the water.
This is one of the simplest ways to grow vegetables at home at a large scale. If you have set up the system properly, then the passage of nutrient flow through the hydroponic medium is smooth and the plants also grow adequately. At home you can perform this experiment with a few wide mouthed jars. Fill the jars with water and mix it with plant nutrients. Allow the plants to float from the top and make sure that the roots are submerged constantly in the nutrient solution.
Using hydroponics for vegetable indoor gardening also ensures growth of healthy and disease free plants. Since it is a soilless method for growing plants, you can use this system for setting up a vegetable garden where there is scarcity of favorable soil conditions. The only disadvantage of passive hydroponics is, the growth of plants might get retarded due to inadequate circulation of oxygen and nutrients. This happens because a pump is not used to supply the nutrients to the roots and they have to depend on the natural rate of flow of the medium.