"Another John" wrote in message
...
(No replies yet, if ever, but anyway... clarification ...

If I keep cutting the upper half of the plant down annually, so that it
doesn't grow overall in size, is it reasonable to think that the root
system will also be kept in check?

By "cutting it down annually" I meant "cutting it down in size", or
"cutting it back" -- not actually cutting it *down*, if you see what I
mean.

John

You can John but if you want the flowers then do it each June after
flowering, if you do it in winter it won't flower (I am assuming like Martin
its a Montana type)

--
Charlie, Gardening in Cornwall
Holders of National Collections of Clematis viticella
and Lapageria rosea cvs
http://www.roselandhouse.co.uk