The Garden Bug: Oriental Lilies
By Brenda Weaver
This plant is one of the easiest to care for. Once it blooms, keep the soil slightly moist. If blooms are very large and the stem bends, stake it for support until the flowers are spent. In autumn, cut off any spent flowers and stalks, but allow the leaves to stay until they die; this fuels the bulb for next year's blooming. Trim away any growth left, leaving the bulb in the ground, and mulch over it with organic bark mulch. In spring, pull away the mulch when you see green sprouts.
Source: gardeningknowhow.com