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.
Plants on Walls – an easy vertical garden design Plants On Walls web site. Check out these clever – and affordable – hanging vertical planters made with a wicking and felt-like material on a corrugated plastic backing.