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..?

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

This may all be overkill; if we just don't get any more
rain, it will get used up fast. Have been curious about
this for some time, so turning to Your Wisdom g

Persephone