I had some Hippeastrum which were very old and had very thick Discs on the bottom which the roots come out of,so I trimmed them.I cut almost all of the bottom off the bulbs. I left only a small amount for the roots to sprout from. Some of the cutoffs weren't picked up,but lay on the sidewalk where sand partially covered the walk. This is the north side of the house.The root calluses made bulbils in about three months.There was no part of the bulb present.