Paperwhite Narcissus will grow happily and bloom with nothing more than water and stones or beach glass. To “plant” your bulbs in any soilless scenario, begin by carefully placing a layer of stones or glass to a depth of about 2 inches in a small vase or about 4 inches in a larger vase. Next place a layer of Paperwhite bulbs close to each other, roots facing down. Put a few stones or pieces of beach glass around and between the bulbs to anchor them in the vase. Leave the tops of the bulbs exposed. Finally, add water until the level reaches just below the base of the bulbs, but no higher (if the bases of the bulbs sit in water, they will rot).
Source: White Flower Farm