Here are the five main components of a hydroculture system.
Plant
Many houseplants can grow nicely in a hydrocultural environment.
Pebbles
Pebbles are used to hold up the plant and its root system. Many people in hydroculture use clay-fired pebbles, which come in different sizes.
Inner Pot
The inner pot is where the plant and pebbles sit. It has slits for water access, as well as a slot for a water level indicator.
Water Level Indicator
A simple float tells the gardener when the plant needs water (lowest level), and when it has enough (upper level).
Outer Pot
The outer pot is a decorative pot where the inner pot sits. It is slightly larger than the inner pot.
Since I can do just fine without a water level indicator, and sometimes, even without pebbles, I always set up my own so-called hydroculture system (just the plant, a container, and water). But if you are interested in having everything on hand before getting started, there are hydroculture kits that are available in many online gardening stores.
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I have another question, I use plants to keep my air clean in my home and hopefully remove some toxins. Can I assume that plants growing in water vs soil would accomplish the same goal? Thanks
Yes, but we need to change the water in a regular basis. Insects love dirty, stagnant still water.