Yes, they can be divided and replanted in early spring. Bulbs should be planted right away, as they should not be allowed to dry out. Keep soil moist, because lilies never go completely dormant. They need well-drained soil that contains ample organic material. However, waterlogged soil will rot the bulbs.
Lilies also do well in containers.
A. Splitting is a problem with navel oranges, but it is not known to have one particular cause. Fortunately, it might not affect oranges every year. Studies in orchards of cultural practices, fertilizer applications and irrigation schedules have shown no difference in the level of splitting. Let us hear from you.