In article ,
Vox Humana wrote:

Except for the Pacific north-west, there really isn't a lot of
overlap on hedging plant requirements between the USA and UK.
Some of the ones we grow will do well in many places there; others
will die during the first winter or summer. And the same thing
applies conversely - anything that takes clay here has to be
SERIOUSLY resistant to its roots standing under water for months
at a time.

I think the problem is more related to the water than the clay alone. I
have six varieties of vibunmum growing well in my heavy clay soil but my
yard is on a slope and there is never any standing water. I did have some
viburnum Judii succumbed to root rot because they were improperly planted.

That is part of the point. Because there is effectively NO evaporation
during the winter, and fairly little during spring and autumn, even
clay slopes get saturated and stay saturated for at least some number
of months. God help me, even my 60% sand soil does (though it is on
the flat).



Regards,
Nick Maclaren.