It is useful to know the class to which a given lily belongs because the class determines its flower shape, its fragrance and, most importantly, its hardiness. Well-known Trumpets include L. Golden Splendor, L. Pink Perfection, and L. Mabel Violet. The bed needs to be dug deeply and the soil might consist of equal parts loam, leaf mold, and sharp sand or gravel. Organic matter may be added to help hold moisture, but the use of fresh manure is discouraged. Lilies like our naturally acidic soils, preferring a pH of around 5.5-6.5, so the use of lime is not indicated.
Weed killers can be deadly to lilies, damaging their roots.
Avoid using them on or even near lilies. Drainage Lilies require absolutely perfect drainage, and perform well in raised beds and on sloping sites with natural drainage. Even a rock-filled bed provides good drainage. Waterlogged soil with poor drainage will rot the bulbs, killing the plants. In addition to growing lilies in-ground, they are excellent subjects for container gardening.