This is a process also called the "Ross method" or "Rossizing" was developed by Henry Ross of Gardenview Horticultural Park in Strongsville, Ohio. It is designed to make hostas develop more buds and expand the clump more quickly. Basically, it involves gently uncovering the crown of a plant in the early spring. With a very sharp blade, you make a vertical cut on each side of the buds on the top of the crown. Apply some rooting hormone such as Rootone to the cuts. This injury causes the plant to respond with the production of more buds and more buds make for a larger plant.

This process is used on those cultivars which multiply slowly on their own. Care must be taken to not cut too deeply into the crown so that you destroy the bud. If you really mess up, it could kill the plant. Take care.