Passive hydroponics is one of the simplest hydroponic designs for home gardeners. Also called semi-hydroponics or passive sub irrigation, this system does not utilize any soil but instead inert materials are utilized as cultivation materials.

These growing material deliver all the mineral plants need from a reservoir below. Passive sub irrigation systems combine simple install with easy daily maintenance.

Passive sub irrigation designs use cultivation mediums only to provide flowers or herbs a base for growth and to transport mineral water, many do not give any nutrients themselves.

Passive Hydroponic Irrigation Uses Growth Mediums

There are a couple varied materials that can be utilized including:

  • rock wool
  • coir
  • vermiculite
  • perlite
  • clay pellets

These mediums are able to move water upwards through capillary action. Depending on the absorption rate of different materials systems could be installed to operate without much daily tasks.

Passive Hydroponic Uses Growth Medium for Fresh Air

Growing mediums has to not only supply water but also have to allow space for fresh oxygen to be pumped throughout the root systems. The mixture of nutrients and fresh air is what assists flowers develop and stay healthy. Different species of flowers can have various mineral and air needs, growers normally mix various materials to make the suitable habitat.

Passive Hydroponics Must Be Regularly Maintained

Cleaning is crucial for passive soilless designs to make sure that no bacteria or fungus develops. As primarily static designs minerals could accumulate around the reservoirs and growing material. Thoroughly rinsing out equipment between crops could make systems last longer and maintain the quality of herbs cultivated.