Place bulbs shoulder to shoulder across the surface of the soil, leaving no space between them. Then top off with more potting soil so the bulbs are just slightly below the surface. Water each container thoroughly, and finish with a layer of mulch. Leave pots outdoors for winter chilling. The more exposure to cold the bulbs get, the better they’ll bloom. In the South, bulbs in containers will bloom better than bulbs in the ground because cold air envelopes the pots, reaching all of the soil.