How close do you plant casablanca lilies together?

All oriental lillies may be planted as close as six inches apart. Most are happier with eight inches. In the case of this particular variety, one "bulb", will, in time, create a small colony of blooming plants over a period of at least three to four years. If this is the desired result, plant about twelve inches apart. Enrich the soil with organic matter at planting, mulch with grass or compost, as any type of pine bark nuggets or mulch will stunt the growth-and almost assuredly prevent the formation of any colony of these exquisite, fragrant lillies.