Of the approximately 400 varieties of the passion fruit plant, only about 30 produce edible fruit. These are mainly categorized as Sweet, Purple, and Giant. The types most commonly available in supermarkets are the Sweet and Purple varieties, which are about the size of an egg. The Giant Granadilla, 8 inches (about 20cm) in length, grows in tropical America, India, and southeast Asia. The Sweet Granadilla can be found in Mexican mountain regions and in Hawaii.