Passiflora incarnata, or Maypop, is a deciduous vine and the cold hardiest of the Passion flower family reaching 13 feet in length with deeply lobed leaves and large purple fringed flowers. They are hardy in the USA to zones 6-9 but best in the UK grown in a cool greenhouse to prevent winter root rot. Move the plants to a cool frost free glass house for the winter gradually withholding water until all foliage dies off, when the plant should be trimmed back. When new growth starts in the spring, repot and resume watering.
