After experiencing hydroculture for about three months, I have a question for myself. Why in the world would I want to have soil (either native ‘dirt’ or artificial soil mix) inside my living environment? It's messy and prone to harbor insect pests and mold particularly when kept too wet. It is only after comparing that I realize that maintaining plants in expanded clay pellets is far more suitable for plants in buildings.

Another revelation is the similarity to sub-irrigation. Even with about thirty years of experience with sub-irrigation it never dawned on me that hydroculture is a form of sub-irrigation.


As Simple as ABC

The essential difference between sub-irrigation and hydroculture is the replacement of soil by expanded clay pellets. They are both what I term “ABC Systems”. The objective of both is to move water from below (A) up into the growing medium (B) while maintaining a dry soil surface (C).

Unlike top watering which is tricky to learn and control, these systems are as simple as ABC. A child can learn them with a minimal amount of instruction. There’s no need to kill plants through trial and error to earn a mythical “green thumb”. 

Text and graphic;  by Bob Hyland

Luwasa pots make growing gardenias indoors a breeze:

How does Luwasa's Hydroculture System work?

LUWASA Hydroculture is so simple!    




Always wait, until the
water-level indicator shows the
minimum level, only then add
water up to the optimum level!


1.Luwasa container *          
(Deco Pot)

      2.Culture pot (Winer)

      3.Water-level indicator

      4. Expanded clay


5.a- Luwasa liquid fertilizer
         b- Luwasa slow release

* Sleeves (for big containers


1.Luwasa container *          
(Deco Pot)

2.Culture pot (Winer)

3.Water-level indicator


Luwasa pots make growing gardenias indoors a breeze.

With Hydroculture, soil is replaced with LECA (Lightweight Expanded Clay Aggregate). LECA is a natural product and is perfect for allergy sufferers as it is clean and hygienic, so bacteria, fungus and soil
diseases have little chance of existing. With hydroculture you don't have
to live without plants any longer.

Hydroculture is the method of growing plants in an inert medium with water and fertilizer rather than soil. This form of plant care is tremendously popular in European countries. Why? Hydroculture is easy, clean and you have greater success in raising healthy house plants. You can tell at a glance when your plant needs to be watered. It's simple! No move over or under watering therefore fewer plant losses.


  • Cleaner than soil and easier to clean up spills
  • Less risk of staining furniture
  • Non-allergic
  • Grow medium never needs to be replaced
  • Odour free
  • Good root aeration because pebbles do not compact
  • Pest free - no centipedes, sowbugs, worms or other soil pests
  • Fertilize just once every 4 - 6 months
  • Water every 2 - 3 weeks (4 max.) and vacation worry free
  • Water level indicator tells when plants need watering
  • High and low water loving plants can inhibit same pot
  • Even nutrient and water supply yields healthier faster growing plants
  • Hydroculture plants have smaller root systems and require less frequent transplanting


Each type of plant prefers a certain amount of light, temperature and humidity to thrive. Choose one of the many good books available on the care of house plants to determine what your particular plant requires.

Light especially is often a limiting factor in many households for growing plants. Be sure to pay particular attention to this factor.

The System Consists of the Following:


-An outer pot that is water tight and will hold the nutrient solution. The
outer pots are available in ceramic, plastic, glass, stone or terracotta.

-A culture pot that is the heart of the hydro system and fits neatly inside the outer pot. The culture pot is of special design. It has a concave bottom so only the outer portion of the pot makes contact with the outer pot and the nutrient solution. The culture pot has slits all around the lower portion of the pot for maximum air flow through the growing medium and root zone.

-The growing medium is a high fired clay called LECA (Light Expanded Clay Aggregate) which provides support, oxygen and capillary action to move the nutrient evenly throughout the roots. LECA provides the necessary support for the plant and at the same time absorb the correct amount of water and oxygen. This optimal ratio of water and oxygen ensures healthy, beautiful plants.

 -Last, but not least, is the water level indicator. It fits neatly into the culture pot and will indicate when to water and how much to water. It also acts as a handle to remove the culture pot so you can leach the medium and root zone once a month with tepid running water.

Text and graphics;  from the best selling houseplant book "How to Grow Fresh Air," by Dr. Bill Wolverton, really brought it into focus for me.





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