Seeds from the Passiflora quadrangularis Erotica Penis Passionfruit. This strange and unusual Passiflora quadrangularis has distinct phallic like fruits. This Passion Vine is root hardy in zones 8 and higher. It likes the full sunshine and a mild dose of potash in the early spring. The flowers on this plant are about 4 inches across and have large maroon petals with purple and blue filaments. This vine produced lots of these blossoms during this past summer.