What type is it? I.e. when did it flower, and is it evergreen?
Early flowering clematis should be cut back hard (often to the
ground) immediately after flowering, but the evergreen C. armandii
doesn't like being cut back too hard. Late flowering clematis
can be cut back hard in winter or early spring, though some do
not like being cut back to very old wood.
Regards,
Nick Maclaren,
University of Cambridge Computing Service,
New Museums Site, Pembroke Street, Cambridge CB2 3QG, England.
Email: nm...@cam.ac.uk
Tel.: +44 1223 334761 Fax: +44 1223 334679