If you were a "spartan", how would you deal with a hoarder?

I am a very frugal person. I don’t have a problem with people owning lots of things except that.. well yes.. I suppose I do otherwise I wouldn’t be asking this. What suggestions do you have for either partner in a relationship where one person is a bit of a hoarder (not obsessively so; just likes to have a lot of things) and the other is a frugal “spartan”?