The message
from "Andrew Thomson" contains these words:

I planted a Physocarpus Opulifolius 'Diabolo' in my garden last week. After
a few days, the tips of the branches began to soften and droop and the
leaves look poorly.

Can anyone help with:

a) diagnosing what may be wrong with my plant

b) what do I do to fix it?

Mine did the same at first. I watered it well, until it established.
It's a lovely plant and very tough once it settles in ; worth taking a
little trouble to give it a good start.

Janet.