Agapanthus
Also called lily-of-the-nile
(Agapanthus africanus)

Soil: Rich, moist soil
Light: Full sun to light shade
Planting Depth: 2 inches
Planting Distance: 18 inches

Agapanthus is popular grown in tubs or mixed with other plants.  You'll get a burst of midsummer color in sun or light shade.  The flowers reach 20 inches tall.

Comments
Agapanthuses need lots of water.  Fertilize once a month.  If the ground doesn't freeze in your area, they can be left in the ground year-round.  In cold areas, lift them in the fall, and store in a cool, dry place.  If they're grown in a tub, withhold water as frost approaches, let them dry out, and store in the tub in a cool, dry place until spring rolls around.