The process for planting hostas is not much more different than any other plant. The planting hole should be dug at least a foot deep. The width of the hole should be one and a half times the expected mature size of the clump. Check with the nursery or web site where you purchased your hosta for the plants expected mature size. Generally, hosta roots grow and spread horizontally, so a large wide hole is best. When planting hostas that are in a container, carefully remove the plant from the container. Sometimes the roots may be bound to the container. Tapping the container sides should loosen the roots from the pot. If the roots are difficult to loosen, it may be necessary to cut through some of them, make several vertical cuts in the routable. Shake the excess soil from the roots and do not use potting soil in the planting hole.
When planting hostas in the selected planting hole, take care to plant it at the same level as it grew in the container. The area where the leaves and roots meet should be at ground level. Soak the root zone thoroughly with water to remove dry pockets and air pockets in the surrounding soil.
Hostas can also be purchased barefoot. Planting hostas that are barefoot require a few extra steps. Before planting, soak the roots (barefoot means no soil) in tepid water for about 30 minutes prior to planting. The soaking should hydrate the roots before they are planted. Form a small cone in the bottom of the hole and then spread the roots over the small cone area and then add the soil. Water thoroughly to collapse the soil around the roots and to remove any air pockets.