In some warm parts of the country agapanthus is a relied-upon garden staple. Elsewhere, the striped blue blooms, carefree nature and tendency to grow into impressive flowering clumps make agapanthus a rising star. Known too as Lily of the Nile, this bold beauty withstands drought and heat effortlessly. Agapanthus plants bloom well when pot bound, making this ideal for cool weather gardeners who choose to overwinter containers and savor the 3 foot tall flower scapes season after season. Bring on the blues! (And the whites, too.)