Susy, I have never even thought of hosta seeds!! I would imagine that they would be really tiny tho and if that is the case, then sprinkling them over the top of the soil would be the way to go..maybe just press them into the surface. The only other things I can think of is to look it up and see if they need a cold period to germinate and you might want to put them on the top of the fridge if you don't have a heating mat. Some seeds germinate better if they have heat.

I'll look around and see if I can find anything out about it.