In message , Charlie
Pridham writes

Any pointers to planting them in ponds (compost and depth below water) I
have seen it done but didn't pay enough attention to the details!!

--
Charlie, gardening in Cornwall.
http://www.roselandhouse.co.uk
Holders of National Plant Collection of Clematis viticella (cvs)


While I was trawling for information I found this site which may be of
use
http://www.geocities.com/koifla/Garden_Ponds.htm
--
Robert