Towards the end of Autumn I planted about a dozen Canna lilies.
Right now they look quite bad - stringy, lots of dead bits etc.
Please advise what I have to do (pruning, fertilizer etc) to
rejuvenate them.
I live in Melbourne and have clay soil.
Note - I planted some in the garden at my weekender at Pt Lonsdale on
the coast. Are the requirements different?

Thanks in advance.