Not as green as cabbage looking

A phrase used by someone recently was

"not as green as cabbage looking"

Anyone know the origin (or even the meaning) of this please

'I'm not as green as I'm cabbagey looking' means 'I'm not as stupid as I might look.' A related expression, meaning much the same thing is 'I didn't come down with the last shower of cabbages.' 'Fraid I don't know the origins.

It sounds Southern to me but I haven't found it in a reference yet.

It sound very Irish to me.

I think you must be right, Barney. I've never heard it outside Ireland. Sometimes the shower of cabbages can be a shower of turnips. Irish turnips are Swedes in Britain and something beginning with 'b' in the US. Confusing, isn't it?

Something beginning with "b." I think you mean rutabagas.
--B. Rerg

Thanks very much for your help.