Passion Flowers: Passion Flowers and Passion Fruit by J. E. Van der Plank
There are over 300 species of passion flower showing a wide variation of colour, size and form, from the green and blue passion flower of Britain, to the yellow passion flower of Australia and the many American species. This book gives details of propagation and cultivation, pests and diseases for plants grown in the house, conservatory or outdoors in temperate regions and tropics. It covers the classification of passiflora, species descriptions and cultivation, hybridizing, grafting, fruit characteristics and uses and the insects like heleconid butterflies which feed on the passion flowers' nectar.