schreef
Well, I have never seen anything resembling fruit. Might this have to
do with the climate? I live in the Netherlands.

***
Probably nothing to do with climate.
The Botanic Gardens at Utrecht have an extensive collection of
Arisaema-species and all or most of these carry fruit.

The fruits cannot be overlooked, in contrast to the inflorescence.
Of course, a specimen with relatively poor reserves will have male
inflorescences only.
So a specimen that is only a beginner at flowering indeed won't have fruit.
PvR