Growing media for the plant tower: cubes, coco and net pots

📘Introduction to growing media

Choosing the right growing medium is an important factor for success in hydroponics. A good growing medium must stabilise the roots, ensure good aeration and provide efficient drainage. It should also be able to store water and nutrients and release them to the plants when needed.

Why the growing medium matters in hydroponics

In hydroponics the growing medium plays a central role, because it replaces soil and makes sure the plants get the best supply of water, nutrients and oxygen. A suitable medium encourages healthy root growth and prevents problems such as root rot or nutrient deficiency.

Key properties of a good growing medium

• ✓Good drainage: Excess water must be able to drain quickly to avoid root rot.
• ✓Air circulation: The roots must be well aerated to get enough oxygen.
• ✓Stability: The medium should give the plants a stable hold.
• ✓Nutrient storage: It should be able to store nutrients and release them to the roots as needed.
• ✓Reusability: Ideally the medium can be used several times without losing its properties.

In a plant tower there is one more point: the material must not change the pH value or release anything into the water, because the nutrient solution circulates past all the plants.

⭐Foam mats: my favourite for the plant tower

Foam is the ideal growing medium for hydroponic systems, especially in plant towers. I have had the best experience with it, and for good reason:

Foam mats give the plant roots a safe and stable base without restricting them. A big advantage is that foam stores only a little moisture and does not cause waterlogging; it guides the water straight to the roots.

🧺Net pots: the perfect match for foam

Net pots, also called net baskets, are designed specifically for hydroponic growing and fit perfectly into the openings of my plant tower. They are permeable and give the roots the aeration they need for the plants to develop healthily.

🥥Coco fibre: natural water storage for leafy greens

Coco fibre is a natural choice made from coconut husks. It works for leafy greens such as lettuce and spinach, but I mainly use it to start tomatoes, peppers and cucumbers. The fibres hold water well. They bring hardly any nutrients; in hydroponics those come from the nutrient solution.

Coco fibre works well in net pots. It only goes into the plant tower when well rinsed, because leftovers clog the pump. For beginners, foam cubes are the easier choice.

🌱EasyPlugs: ideal for starting seedlings for the plant tower

EasyPlugs are small seed-starting plugs that are perfect for germinating and raising young plants for the plant tower. They store water especially well, which makes care easier in the first growth phase, and give the young plants a stable structure.

EasyPlugs are seed plugs made from pressed, bound material. They are a good choice if you do not want to use foam. Keep them moist but not wet, and like the cubes, only stand them about one third deep in water.

⚪Perlite: for excellent drainage

Perlite is a light, porous material that supports drainage and aeration in your plant tower. Perlite is a good choice especially for plants with demanding root systems.

Perlite is expanded volcanic rock, pH neutral and releases nothing into the water. But it is so light that it floats. So it does not belong loose in the tower, where it would be washed out and end up in the pump. It works best mixed into coco in the net pot, about one part perlite to three parts coco. It gets dusty when you transfer it, so moisten it first.

🪨Rockwool: a professional medium

Rockwool is made from molten basalt rock that is spun into fine fibres and formed into blocks or cubes. It is known for its excellent air and water handling.

⭕Support rings instead of neoprene collars: 3D-printed holders without substrate

Neoprene collars are a popular and efficient aid in hydroponics, especially in systems that work without substrate. They offer many advantages, mainly because they are easy to handle and hold plants stable and secure.

Instead of foam neoprene collars, I use my own support rings from the 3D printer. They do the same job and fit my net pots exactly.

🏁Conclusion

The perfect combination in the plant tower for successful plant growth

For successful hydroponic growing in a plant tower, the choice of growing medium is decisive. Foam and net pots offer an optimal combination of stability, aeration and easy care. Coco fibre and perlite complement the system for an even water supply and root aeration.

With these materials you create ideal conditions for your plants, entirely without soil. Start your hydroponics project in the plant tower and look forward to healthy, fresh harvests straight from your own hydroponic garden!

My way is simple: start seedlings in foam cubes, tomatoes and peppers preferably in coco, move them into the net pot and secure heavy plants with a support ring. Loose substrate never goes into my tower.