Yes, it can - usually needs replacing within 2-5 years though, unless you take cuttings.

Are you sure, Bamboo? My info is that Pelargonium graveolens is only hardy to USDA zone 9b, which is 25 deg. F. It gets a lot colder than that in Iowa! I would treat it as an indoor-outdoor plant there.

Yes,Tugbrethil, of course - but the Guest is asking if it can be kept indoors in winter, so presumably, they already know its tender.

Well I must be really losing my marbles here - I could have sworn guest's question asked if it was alright to bring it indoors in the winter, not leave it outside!
No, you can't leave it outside, it must be brought indoors for winter.