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David Hare-Scott[_2_] · 12-02-2009, 11:47 PM posted to rec.gardens

wrote:
Here in So. Calif, we have had drought conditions for several
years, so now that we are having some rain, am saving every drop of
rainwater I can. I now have a large barrel full, and more may be on
the way - I hope!

Question: How long can I "safely" keep the barrel full
of H2O? Without breeding mosquitos, worst case, or..?

Indefinitely if you exclude mosquitos with a functional lid.

Is it necessary to put some chlorine in, and if so,
how much would be safe for the plants.

No, it may grow some algae if light gets in but that will not harm plants.
There is no need to treat it like drinking water.

If by "barrel" you mean 50-100 gallons it will be of very limited use. If
you want to support your garden rather than a few pot plants you will need a
much bigger tank (1000 gal plus) and to reorganise your roof plumbing to
fill it. Depending on the size and layout of your property, the soil and
other considerations a ground tank (ie small dam) may be cheaper and more
effective. This is quite a complex issue.

David