From the little I know about Gramm. scriptum, I suspect your "many years" may become a "few years" as it is a very vigorous grower, quickly becoming a large plant if the one I have is any indication.
For long term potting, I would suggest something that doesn't readily break down.
Baz
Last edited by Baz in Oz; 06-03-2011 at 04:17 AM..
Reason: two thumbs on my typing hand