Gardens Oxygenating plants
many oxygenating plants should I have in my pond?
is a very hard question to answer accurately. Despite the name,
you should not rely on these plants (which I prefer to call deep
water aquatics) for oxygen in your pond. It is true that all plants
produce oxygen during the day, but they also produce carbon dioxide
If you have a lot of
plants then you can run the risk of oxygen depletion and carbon
dioxide poisoning of your fish. This is actually quite common at
this time of the year, as warm water naturally holds less oxygen
than cool, exacerbating the problem.
The cure is to circulate
the water using a fountain or waterfall which will oxygenate and
drive out the CO2. Of course, if you are doing this you do not need
to rely on the plants for O2!
The other reason to grow
these plants is to help with water clarity. While theoretically
possible to do this, I have found that in NZ it is quite unreliable.
You are much better off generally to take care of water quality
with a good filter system.
Therefore I suggest
that you plant your pond to suit your taste. Some people like lots
of plants, some not so many. Having said all of this, the common
formula used by landscape gardeners is five plants per square metre
of surface area. I hope this helps!
Gardener, Issue 93, 2002, Page 20
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.