Plate No. 39
Dragon Fruit
Hylocereus undatus
"Night flowers that ripen into pitaya"
Native to
Tropical forests of southern Mexico and Central America

History
A brief account
A climbing epiphytic cactus whose triangular stems clamber up trees and rocks. Its enormous white flowers open for a single night and, if pollinated, ripen into the vivid magenta pitaya fruit now farmed across Southeast Asia.
How to care for
Dragon Fruit (Hylocereus undatus) grows best when its natural cycle of strong light, freely draining soil and measured watering is respected. Give it bright indirect light with some direct sun. Water it according to its seasonal needs: regularly in summer; reduce in winter. Plant it in loose orchid-and-cactus mix with bark. A container with an unobstructed drainage hole is essential, because moisture lingering around cactus roots can quickly lead to rot.
Keep its temperature needs in mind: 15–35°c. frost-tender. During active growth, check the compost before watering rather than following a rigid calendar, since heat, light and pot size all change how quickly it dries. Reduce watering during cool or dormant periods, keep the plant well ventilated, and wait until the growing medium is dry before watering again.
How to propagate
Stem cuttings root within weeks. Take material from healthy growth with a clean blade or tongs, then leave the cut surface in a dry, shaded place until it forms a firm callus. Set it into a dry, gritty medium and introduce water sparingly only after roots begin to develop.
Young cacti are especially vulnerable to excess moisture. Use a small pot with excellent drainage, provide bright filtered light while roots establish, and move the new plant gradually into the light, temperature and watering conditions preferred by a mature Dragon Fruit.
Cultivation
Quick tips for care & planting
- Light
- Bright indirect light with some direct sun.
- Water
- Regularly in summer; reduce in winter.
- Soil
- Loose orchid-and-cactus mix with bark.
- Temperature
- 15–35°C. Frost-tender.
- Propagation
- Stem cuttings root within weeks.