co2 in the garden
lighting, so will continually off-gas
even during the night cycle when
CO2 isn’t being consumed. The
manufacturer’s estimate for lifetime
on this product is usually about two
months. Depending on the size
of the garden, multiple packages
might be required.
Bottles of pure CO2 are commonly available at most hydroponics retail outlets, where they can
also be refilled or exchanged for
new bottles. With this method,
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Maximum Yield USA | February 2014
you use a regulator connected
to a CO2 monitor. The monitor
reads the CO2 level in the space,
opens the regulator when CO2 is
needed in the space, and closes it
when the levels reach the presets
on the monitor. This is a relatively
inexpensive up-front cost, as the
bottles aren’t particularly expensive. However, they will require
frequent refilling or exchanging,
which can become tedious for
many gardeners.
Carbon dioxide generators are
also commonly available from
most hydroponics retailers. These
generators create CO2 in