Thanks, Margaret. The cutting tip for A. bloom stalk is wonderful. I have got a special garden scissors just for cutting Amaryllis stalks, so probably less difficult.
Thanks, Tarev (and Barbara) for suggesting use soil. I now plan to do so for the coming "Samba". Last week, I bought this beautiful African Violet and in the pot there are some "straw-like" covering. I saw that is used by some Amaryllis sellers for covering potted bulbs or grown plants. Just wonder what's the name of it? Can I find it in HD or other stores?