Plant hostas in the spring or early fall. The leaves are not fully emerged and it is easier to care for unestablished plants in mild weather.
Hostas need a shady location, well-drained soil and one inch of water each week. Plant hostas one to three feet apart. Position the crown just below the soil and leave a small crater around the plant so water funnels towards the base. Mulch new plantings with straw and water them well if the weather is hot. Hostas typically live a long time so choose the planting location carefully and plan to leave them undisturbed for years.