The message
from Derek Turner contains these words:

On Sat, 06 Feb 2010 14:52:20 +0000, Timothy Murphy wrote:
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Are they likely to create new foliage?

Try stopping them!

And if you are uncertain just take some cuttings as a back-up. Simply
cut off some stems about a foot long and insert them into the ground the
same way up that they were growing. I have done this a number of times
to create several new plants.

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Compo