Bark mulch is made up of mostly suberin which is long chains of fatty acids.
No cellulose avail. to feed the soil micros. That's the down side.

--
Sincerely,
John A. Keslick, Jr.
Consulting Forester & Tree Expert
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.


"zzznot" wrote in message
news:sVdCj.21308$Qy3.12475@trnddc03...
I thought I'd spread some decorative bark on
the ground of the flower beds and between
some bushes, where the adobe soil otherwise
gets cracked and bare. It's supposed to
hold down weeds and retain moisture. So,
is there any downside to using it? Or, is
it just good organic matter anyway?

Thanks.

J.