A Hydroponic Gardening Primer

Reader Contribution by Maryann Robinson
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What exactly is hydroponic gardening? Though it may sound
complicated, it’s really not.  The word “hydroponic” comes from the Greek “hydro,” meaning

water, and “ponic,” meaning
work. The basic concept is this: growing
plants in a nutrient rich water solution rather than in soil.

So, if you don’t use soil, what do you put
the plant in? Instead of soil, hydroponic
growing utilizes an inert growing media. Some examples are coconut fiber, rockwool and different types of “grow
rocks.”

Coconut fiber is also called “coir” and is similar to peat moss but is a renewable resource.  It’s the fibrous husks of coconuts ground
into a peat moss-like consistency.

Rockwool is a moisture-retaining media made from
basalt rock. It is super-heated and
melted down before being spun out like cotton candy. It’s then shaped into cubes, blocks or slabs.

Sunleaves Rocks are irregular-shaped, porous stones made of
shale rock. They’re a byproduct of brick-making.

Hydrocorn is an expanded clay medium.  It is puffed lava rock with a clay coating. 

Growstones are very light pumice-like stones that are
made out of recycled glass dug out of landfills.

All these inert medias are just used to give the roots
something to anchor onto in order to support the plant. All the nutrients required by the plant to
produce chlorophyll, which they use for food, must be provided by you. That is why it is very important to use a
fertilizer that is specifically designed for hydroponics. Many soil fertilizers might not contain all
the necessary elements the plant needs for healthy, vigorous growth.

You may think that hydroponics is a relatively new concept
in gardening, but this assessment couldn’t be farther from the truth. The ancient Aztecs grew food crops on rafts
in nutrient-rich lakes and streams, and it is also believed that the Hanging
Gardens of Babylon may have been one of the first ventures into the wonder of
hydroponics.

There are different types of hydroponic systems, most of
which recirculate the nutrient solution, conserving water in the process. The simplest type of system is a deep water
culture, or DWC.  All you need to make a DWC system is a reservoir (or bucket), a net basket, grow media, an air pump and stone.  You simply place
the plant in the net basket with the grow stones (the rock-type media works
best for this type), fill the bucket with water and add hydroponic fertilizer. Oxygenate the water with the air stone and submerge the net basket with the plant in
the solution. Voila!

There are, of course,
other types of systems that have more components. Ebb-and-flow (also called fill-and-drain)
systems employ the use of a grow tray and a reservoir. The grow tray sits on top of the reservoir
and the nutrient water is pumped up from the bottom reservoir to the grow tray
to feed the plants. It’s usually set on
a timer, so when the flood cycle stops, the water drains back down in to the
reservoir. Many drip systems work this
way also. The timer kicks on the drip
cycle and the excess water drains back down.

With all types of hydro systems, there are a few general
rules:

1 Always maintain you pH (acidity or alkalinity) between 5.5
and 6.5

2 Change out your reservoir with fresh water and nutrients
every two weeks

3 Always use hydroponic fertilizer

4 Have fun growing

I’m attaching a simple hydroponic experiment that is fun for
children and adults to this blog to get you started down the hydro path. If you have any questions about hydroponic
gardening feel free to contact me at the Worm’s Way Facebook page or website.   Happy hydro!


 

Photo by Fotolia/Kenishirotie