Rooting Hosta from leaf cutting
I have rooted the Hosta plants from leaf cuttings with 80% success by keeping cuttings in water in one experiment and about 30% success using poting soil.
First select the plants older than one year and secondly dig out the plant with basal part with roots in tact.Remove the dead leaves and cut off roots so as not to disturb the basal patrt. You will see all the leaves attached to base which is slightly bulged and close to white in color.
Now lift the outer most leaf and slide the sharp blade or knife bellow it and gently cut off with some basal matter with it. Cut off all the leaves and set them in water.You may plant some leaves in poting soil for curiosity.
I am sure you will get good success.