Planted May 27, 2010.
The Cobra Lily likes shade and to be kept cool and moist, so I planted it near the deck steps where it is shady and we can keep it watered.
Although it likes water flowing over its roots, it doesn't like standing water. After I dug a hole, I filled it with water and it seemed to be taking too long to drain, so instead of putting the bulb down in a hole, I built up the area with a thick layer of humus topped by a thick layer of moisture-control potting soil, then covered that with mulch. The bulb needs to be at the soil line, so it is atop all this build-up.
This was all done where there is a slight incline, so excess water should run off through the humus while the moisture-control aspect of the potting soil plus the cedar mulch cover should help keep the roots moist.
The first night, something dug into the bed, so the next day I added the usual chicken wire over the bulb, topped by soil and mulch.