Introduction to Hydroponics 1-4

Hydroponic Growing Mediums:

In a traditional garden, plant roots are in the soil. They support the plant and search for food and water. In hydroponics, we often use a growing medium in place of soil. The roots of a hydroponic plant do not work as hard as those of a plant grown in soil because their needs are readily met by the nutrient solution we feed them.

Ideal mediums are chemically inert, porous, clean and able to drain freely.

Many materials have been used as hydroponic growing mediums. These include: vermiculite, saw dust, sand, peat moss and, more recently, rockwool, perlite and expanded clay pebbles. Today's popular growing mediums, perlite, 
rockwool and expanded clay pebbles are described below

Perlite is derived from volcanic rock which has been heated to extremely high temperatures. It then explodes like popcorn, resulting in the porous, white medium we use in hydroponics. Perlite can be used loose, in pots or bagged in thin plastics sleeves, referred to as "grow bags" 
because the plants are grown right in the bags. Plants in perlite grow bags are usually set up on a drip feed system. Perlite grow bags usually hold 3 or 4 long-term plants. 
Perlite is also used in many commercial potting soil mixes. 

Plants grown in perlite
Plants grown in perlite

cucumber seedling emerging from rockwool cube
cucumber seedling emerging
from rockwool cube

 Rockwool is derived from basalt rock. It too is heated to high temperatures but then is spun into 
 fibers resembling insulation. These fibers are spun into cubes and slabs for hydroponic production.
 The cubes are commonly used for plant propagation and the slabs are used similarly to the perlite grow bags. A plant is  set  onto the rockwool slab and grown there. The plant roots grow down  into  the slab. Rockwool slabs usually hold 3or 4 long term plants.
Expanded Clay Pebbles. Growrocks                                                                                                    
Many hobby hydroponic gardeners use expanded clay pebbles for their growing medium. 
Expanded clay pebbles have a neutral pH and excellent capillary action. Often Ebb and Flow systems use expanded clay pebbles in the grow pots as the growing medium.

Expanded clay pebbles
Expanded clay pebbles