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Selenicereus undatus

White-fleshed Pitahaya

Overview

Selenicereus undatus, commonly known as dragon fruit or pitahaya, is a climbing epiphytic cactus species celebrated globally both for its exotic, sweet fruit and its magnificent, night-blooming blossoms 1.

Taxonomy and Naming

Belonging to the Cactaceae family, this species was historically classified under the genus Hylocereus. Modern molecular phylogenetic research merged Hylocereus into Selenicereus 2. The specific epithet 'undatus' refers to the wavy margin of its three-angled photosynthetic ribs.

Distribution and Habitat

While its exact native range remains elusive due to extensive ancient cultivation, it is believed to originate from southern Mexico and Central America 1. It grows naturally as a climbing epiphyte or lithophyte, clinging to trees and rocks in seasonally dry tropical forests.

Appearance

It features long, green, three-ribbed segmented stems with wavy margins that produce aerial roots for climbing. The breathtaking white flowers open only at night, spanning up to 30 cm in diameter with a sweet fragrance. Following pollination, it produces the iconic pink, scaled pitahaya fruit with white sweet pulp and tiny black seeds 2.

Cultivation in Care

Unlike desert cacti, S. undatus thrives in rich, organic, well-draining soil and appreciates consistent moisture during the growing season. It requires bright filtered light and protection from hard freezes.

Common Cultivation Errors

Overwatering in heavy soils leads to immediate root rot. Conversely, insufficient light results in weak, thin stems (etiolation) and prevents the development of its spectacular flowers.

Bibliography

References

  1. Plants of the World Online (POWO). Selenicereus undatus (Haw.) D.R.Hunt. Kew Royal Botanic Gardens. ↩
  2. Anderson, E. F. (2001). The Cactus Family. Timber Press, Portland, Oregon. ↩
Light

Bright Indirect Light

Thrives in bright, indirect sunlight with partial morning sun.

Watering

7-20 Days

Keep soil evenly moist but not waterlogged; let dry slightly between waterings.

Soil

Rich, well-draining, organic-rich cactus potting mix

Rich, well-draining potting soil containing peat, perlite, and organic compost.

Safety

Pet Friendly

Non-toxic to cats and dogs. Minor spines require gentle handling.

Difficulty

Easy

Very easy to grow, though flowering and fruiting require optimal warmth and light.

Native Habitat

Mexico and Central America

Believed to be native to Mexico and Central America, it is now widely naturalized and cultivated across tropical regions worldwide.

Frequently Asked Questions

Can dragon fruit cactus be grown in a pot indoors?
Yes, it can easily be grown indoors or on balconies in a large, deep pot, provided with a sturdy trellis or moss pole for climbing.
How often should I water my dragon fruit cactus?
Water about once a week in summer when the topsoil dries out, and reduce to once or twice a month in winter. Being epiphytic, it is sensitive to waterlogging.
Is it toxic to pets?
No, Selenicereus undatus is completely non-toxic and safe for cats and dogs. However, the small spines on the stem margins can cause mild physical irritation.
What kind of soil should I use in a pot?
Use a well-draining cactus mix enriched with high-quality compost or peat moss to provide both drainage and essential nutrients.
When will my cactus bloom?
The plant typically begins blooming on summer nights once it reaches 2-3 years of age and has established sufficient vegetative mass.
How can I get it to produce fruit indoors?
For fruit production, ensure plenty of sunlight and perform hand pollination (using a brush to transfer pollen) when the flowers open at night. Many cultivars are self-fertile.
How fast does it grow?
It is a fast grower in warm and bright conditions; stems can grow more than a meter in a single season. It can be easily controlled with regular pruning.
What causes yellowing and softening of the stems?
This is usually a sign of overwatering or root rot. Stop watering immediately, prune away rotten parts, and propagate healthy stem cuttings to save the plant.
Can I leave it on the balcony in winter?
While it can tolerate brief chilly periods, it is best to bring the plant indoors or move it to a sheltered area when temperatures drop below 10°C (50°F).
What should I consider when pruning?
Use sharp, sterilized tools. Prune away excessively long or weak branches to strengthen the main framework of the plant and improve air circulation.