Hi from a newbie!

As I've stated, i am a newbie, both to this ng and gardening, so I hope some
genius out there may be able to help me.

I have a plant(name unknown,sorry) in my back garden that looks on its last
legs. It is a red,tall leafy number(rubbish description,sorry). It's stems
and leaves have started to wilt dramatically, but with no discolouration of
the leaves.

Does anybody know how I can attempt to revive this plant, or is it gone
beyond that?

Thanks in advance, Mac