[NASH]

and when can i transplant them some where else ?

[digalotty]

i pot up all runners required and then when they can be cut free i chop the foliage down to allow regrowth

[Trillium]

And after you chop off all the old foliage, give the plants a good feeding with manure.

[DD.]

As regards moving them, see this thread:

http://chat.allotment-garden.org/index.php?topic=79958.0