Answer: This is a named variety of Asiatic lily. Lily blooms do not last terribly long naturally, and since plants typically experience some transplant stress if moved when they are in bloom, the petal drop is not too alarming. I would worry a bit about the change in foliage color however. The following should help you trouble shoot.
These bulbs should be planted in a full sun or at least a half day sun location.
As a container grown plant, it should be planted at the same depth as it grew in the container, no deeper and no higher, for best results. Planting too high could stress the plant by drying out the bulb, and planting too deep could damage the stem.
The soil should be kept slightly moist like a wrung out sponge, not sopping wet/saturated and not dried out. Overwatering would be damaging to the bulbs, as would underwatering. To know if you need to water, check the soil with your finger. If it is still damp, do not water yet.
Lilies require a well drained soil and would not do well if planted into heavy clay because the clay drains too slowly. If your soil is clay based it is best to amend with organic matter and a small amount of coarse builders sand or fine grand and to also plant on a slight slope to facilitate drainage.
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