I heard that yellow hibiscus is rare.

Is mine of the rare variety, or is it a different one?

Yellow is common in tropical hibiscus plants but rare in some of the other types of hibiscus.

Ok. I have a red hardy hibiscus, will/can they pollinate each other?

Will either give off seed?

There is some Intergeneric hybridization done with the hardy hibiscus, but sadly, when I've grown the resultant plants, they failed to produce seed...
They had to be vegetatively propagated.

Whether your plants can be crossed... is one of those things where... you learn by doing.

we can't advise, when we don't even know what types of hibiscus are being discussed.

Before attempting Intergeneric crosses, suggest simply growing out the seeds that these produce...

Ok, but someone told me that these will not produce seeds. Is that correct?

I've never paid attention to them until this past November.

I would love to grow hibiscus seeds even if they produce sterile plants. I think that's what you're saying will happen.

The post about sterile plants... referred specifically to intergeneric hybrids.

If these produce seed from self fertile pollination, then... the seedlings would not be sterile.

we still don't know what you have... maybe you already have sterile plants.

Do you have the tag that came with the plant?

Most of my experience with hibiscus and mallows is with species plants... and those all produce viable seed for me.

So it looks like it is forming seed. Time will tell.