How to Grow paperwhite narcissus bulbs in a vase

We are shown by a nursery manager how to grow Paper White Narcissus. While not hardy outdoors they are simple to grown indoors. We are shown how to grow in a vase or pot. For the vase, pebbles are placed on the bottom then about two inches of water. The bulbs are put tips up roots down, then a little more pebbles on top. The potted version is filled with a moist soil and water mixture. The bulbs are placed identical with soil lightly on top. With the pot a flowering support structure is placed with it for the future flowers. Both are placed in a cool dark location at about 50-60 degrees. After roots in the vase, and foliage in the pot began to show, they can be moved into a bright sunny location where they will bloom.