In article ,
Jeff Layman wrote:

On 10/08/2012 22:42, Kay Lancaster wrote:
On 10/08/2012 00:27, David Hare-Scott wrote:
Kay Lancaster wrote:
Treat clay soils with respect... they're difficult to grow on.

yes indeed.

D

A commonly held and vastly mistaken view, IMHO. Difficult to work
maybe. But they are not difficult to grow on at all, if you keep to a
couple of simple rules. Firstly, never try to plant anything when they

I, too, have been growing on clay for about 40 years now... first the clay
subsoil that was all the builders left when they stripped the top soil
and sold it at my childhood home in Iowa, and now out here in Oregon --
both yellow clays, though the Oregon clay is calcium poor, rocky and
nearly free of worms (there are no native worms out here),

Is that normal? I don't know anything about Oregon Clay, but would have
though that if there are almost no worms, more-or-less nothing could
grow as recycling of plant material couldn't take place, and aeration
would be non-existent. What happens with the native plants out there?
Or is the area basically a clay desert?

Here, 70 miles north of San Francisco, we have heavy clay. We scratched
at it for years before getting serious. The final solution was tilling
in sand (probably %5), and organic material. On this was planted rye
grass, and buckwheat, which break-up, and fills the soil with an amazing
amount of roots. Lastly, we keep the beds mulched, which allow the worms
to do most of the heavy work of turning, aerating (good soil is 50% air
spaces), and draining the soil.

For sure, plants like sequoias, oak, bay, and manzanita can punch
through the clay, but east of here in the town of Sonoma, there is
impenetrable hardpan (clay) a few feet below the top soil, which can
prevent perennials from finding the water they need.

Gotta work with wha'cha got.

so it
compacts easily and often requires mechanical aeration-- the Iowa soil
did not require much mechanical aeration and was calcium rich.

It wasn't until I moved
to an area with a lovely, deep prairie topsoil that gardening became fun.
There, I could stand barefoot on bare soil and wiggle my feet a bit and
dig myself in ankle deep, the soil was that friable and loose. Stick a
plant
in the ground and it grew.

But that's too easy. Don't you want a challenge? ;-)

Though clay holds soil moisture well, it's often not as available to the
plants as water in sandy soils, e.g.:
http://ag.arizona.edu/turf/tips1095.html
which is a special problem in drought.

Interesting article. Grass, though...

--
Welcome to the New America.
http://www.youtube.com/watch?v=hA736oK9FPg
or
E Pluribus Unum
Green Party Nominee Jill Stein & Running Mate, Cheri Honkala
http://www.democracynow.org/2012/7/13/green_party_nominee_jill_stein_running