Choosing The Right Medium For Your Hydroponic System

In hydroponics, a “growing medium” is what you will use instead of soil.

When developing your hydroponic system, it is imperative that you select a medium that matches your needs, will give you the biggest yields, and will be the easiest to maintain. Here are a few of the most popular growing media used in modern hydroponic systems, and the advantages and disadvantages of each.


Coconut fiber, sometimes called cocopeat, is simply the powdered husks of coconuts. It is increasing in popularity because it is one of the completely organic media available for hydroponic systems. It is known for its large oxygen and water capacity, which means your plants have a better chance of surviving if something goes wrong with your hydroponic system.


Perlite makes a great hydroponic planting medium due to its light weight, porosity, and inert nature. Perlite is made by heating silica (flakes of glass) until it expands (like popcorn). This medium keeps plants more open to air, while still having good water-retention properties, and therefore it makes a good medium for hydroponics.  It is often used as a filler and mixed with heavier media to help improve drainage.


Arguably one of the most popular media to use in days past has been hydroton expanded clay pellets. As their name suggests, these are made by expanding clay to form round balls of porous material. The best part about them is the fact that they release almost no nutrients into the water stream and are pH neutral. In addition, their spherical shape and porousness help to ensure a good oxygen/water balance so as not to overly dry or drown the roots.


Rockwool is probably the most popular growing medium used in modern hydroponic systems. It is a material made from basalt rock and which, which is melted and “spun” so the material turns into interconnected fibers. One of the primary advantages of rockwool is that it retains water very well, which means that your plants are less likely to be harmed by dehydration if your pump fails. It also holds a great deal of air, which means that it will make it more unlikely for your plants to be over watered. However, the dust and fibers from this growing medium can be hazardous, so you have to careful when you handle it. Because this material has a high pH level, you may need to pay special attention to the pH level of your nutrient solution to ensure the plants in your hydroponic system remain healthy.


Floral foam can be used as a growing media in hydroponics as well, and is similar to the oasis cubes, though the cell size is larger in the floral foam. They are rigid green used by florists to hold the stems in their flower displays. Floral foam is an open cell material which means that the cells can absorb water and air. The open cells wick moisture throughout the material, and the roots can easily grow and expand through the open cell structure. While similar to rockwool, floral foam doesn’t become waterlogged as easily as rockwool cubes. Even so don’t let it stay in constant contact with the water supply, or you’ll still have water logging issues.

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