Assuming this means Rhoicissus rhombifolium, the RHS Encyclopedia says by
seed in spring or by semi-ripe cuttings in summer but gives no more
indication than that. Just nip a few pieces off and try them out. Perhaps
taking some bits just above a node would be a good thing to experiment with,
too. Rooting things in water seems to take ages (probably because you can
watch it) so don't give up too soon!
--
Sacha
www.hillhousenursery.co.uk
South Devon
(remove the weeds after garden to email me)
If this is 'Grape Ivy', aka 'Cissus rhombifolia', it should be easy
enough to root from stem cuttings now, though I think it's getting a
bit late. I wouldn't use water, as water-roots can be difficult to
transfer to potting mixture.
Take a nice shoot: you want one with leaves at the top and bottom, and
somewhere vaguely around 4" long. Cut cleanly just below a
leaf-joint, gently take the leaves off the bottom half, and stick in a
?3" pot of moist (not soggy) half-grit and half-potting mixture. Put
it in a shady but reasonably warm place, cover with a plastic bag not
touching the leaves, and wait till you see new leaves beginning to
grow at the top; then you can move it into a slightly bigger pot.
Better houseplant gardeners than I may contradict, of course.
Mike.