Agapanthus, known as Lily of the Nile, is a summer-flowering perennial bulb. The plant is primarily grown for its globe-shape flowers on tall stalks. When agapanthus does not bloom, the cause is often improper planting or weather conditions.
Agapanthus grows from rhizomes into a mound of long leaves with a tall flower stalk. The stalk, 12 to 60 inches tall, holds a round flower head of trumpet blossoms in blue, white or pink.
Some agapanthus cultivars are evergreen with year-round foliage. Others are deciduous with leaves dying back in autumn.
Agapanthus fails to bloom when it is root-bound or when it is over-divided with too few rhizomes to support flowering. Replant or repot in organic, well-drained soil.
Agapanthus flowers poorly when planted in shade or exposed to cold weather. Plant in full sun and protect from winter weather with mulch or frost covers.
Agapanthus needs care after flowering. Water the plant through dry summer weather so that flower buds develop for the following season.