These evergreen woody-stemmed climbers are grown for their unusually shaped blooms and some produce edible fruits. Most are grown in thebut there are some hardy enough to survive outside.
Suitable site and soil. Outdoors plant in well-drained ordinary soil in a shelteredin a sunny spot where they can be trained against a wall. In a , plant in a sunny where they can be trained up a pillar or trellis in a tub or John Innes No. 3 or in well-drained, good soil in a greenhouse border.
Cultivation and care. Plant outdoors in spring and in green- 148 houses in late winter. Water freely in spring and summer; water sparingly in autumn and winter. Keep above 7°C – 45°F in greenhouse.overgrown plants in late winter removing weak shoots; remove frost damage from outdoor plants.
Propagation. Increase by semi-ripewith bottom heat in summer or from sown in greenhouse in spring.
Recommended varieties. P. caerulea, with pink-Hushed whitewith blue banded crowns, climbs to 6m – 20ft, is frost hardy and can be grown outdoors. A good variety is P.c. ‘Constance Elliott’ which has pure white and is more hardy. Fruit producing P. edulis can grow in a greenhouse to 6m – 20ft and has white and purple flowers in early summer.
Pests and diseases. Not pest prone but may suffer thedeformation and discoloration of cucumber mosaic virus.
In summer, P. quadrangularis has unusual green, white, pink and purple flowers. It makes a truly exoticin a conservatory climbing up a pillar from a pot.