There are some small newish green leaves (I may have mistook small
growth for new growth) but the main leaves are now starting to yellow.
Another thing was that the leaves are much smaller than the healthy
plant that I do have. I did speak to a nursery on the weekend and they
suggested that there are two things that mop tops hate - wet roots and
shade. It looks like I may have to move these and try something else.

I did see the Evergreen Cascade® Alnus on hellohello.com.au which may
suit. Any comments on these?

Steve