Adiantum venustum - hardy maiden-haired fern

I have seen adiantum venustum described as both deciduous and evergreen by UK selling sites. Does anyone with one know how it behaves? I am looking for an evergreen. It will be in a shady, sheltered spot, in a window box next to wall.

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I've only ever grown the houseplant form and found then fussy about humidity, even in a bathroom.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I've given numerous large clumps away to people over the years ; never found it to be a problem !
I didn't know there were outdoor ones. I'll definitely look out for them once the drought' s over.