"Steve" wrote
One of my red leaved cordylines has snuffed it and on inspection
the bark at the base has rotted away and woodlice have moved in.
Another of these cordyline is suffering a similar fate, although
the bark has only rotted half way round. Are the woodlice the
culprits, or just taking advantage? If not the woodlice, what is
the cause? Thanks in anticipation.

At a guess, it's frost damage. The woodlice then move into a nice home with
meals available.
The red cordylines are more tender than the green variety which itself is a
lot hardier when large.

Noticed a self sown seedling growing which is the first one despite ours
flowering for years.

--
Regards
Bob
In Runnymede, 17 miles West of London