The Size of an Agapanthus Flower

Agapanthus flowers are warmth-loving herbaceous perennials. Also called lily of the Nile or African lily, these plants grow on rhizomes and spread rapidly, forming attractive clumps of tall, slender flowers.

Size
Agapanthus flowers can grow up to 4 or more feet tall, depending on the species and cultivar. Purple Cloud and Storm Cloud are two of the tallest varieties. The colors of the flowers range from creamy white to deep blue and pink. The leaves can reach 12 inches in length.

Culture
Agapanthus flowers grow best in U.S. Department of Agriculture Plant Hardiness Zones 9 through 11. They prefer a sunny location with rich, well-draining soil, although the flowers will also grow in partial shade. Too much water in the soil will cause the fleshy rhizomes to rot. Once established, they require little care.

Uses
Agapanthus flowers make a stunning border plant, especially if planted in the back of a garden along a fence. They are also frequently used in containers. The rhizomes can be left in the ground if the temperature does not get below freezing. Otherwise, dig them out of the soil when fall arrives and store them in a dark, dry location until spring.

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What Is an Agapanthus?

An agapanthus is a bulb flower commonly called lily of the Nile, although it is neither a lily nor from the Nile River region. It is native to South Africa. The plant is perennial in U.S. Department of Agriculture Plant Hardiness Zones 7 through 11. It has green, strappy leaves similar to those of a daylily but deeper green and with rounded tips. It produces blue, white or violet alliumlike blooms at the end of stalks that grow from 2 to 6 feet tall.
Flowers
Agapanthus flower best when they are crowded. In the ground, they will multiply and give a good show after about three years. Their preference for crowded roots makes them good container plants. Two common varieties are Storm Cloud, which produces blue flowers on 4-foot stems, and Midnight Blue, a dwarf form that grows to 18 inches with dark blue blooms. Agapanthus flower in late summer, July through September.

Care
Plant agapanthus 1 inch deep in well-drained soil in full sun, except in USDA zones 10 and 11, where part shade is better. Agapanthus are drought tolerant once established, but water regularly the first year. Clean up dead foliage in late winter before new leaves emerge.

Division
Wait until the bulbs have packed the pot or their plot before dividing, which takes about five years. Cut them apart so each section has a few roots, then replant. The plants won't bloom until the second year.

Winter
Left in the ground and mulched, the bulbs will overwinter in USDA zone 7 and above. In colder zones, lift them in fall after frost has killed the foliage and store them indoors in vermiculite or peat moss in a cool, but not freezing, basement or garage. Replant in spring. Or leave them in their pots and move the pots into the storage area.

Source: http://www.ehow.com/info_7937796_agapanthus.html