Selenicereus megalanthus

Selenicereus megalanthus (Yellow Pitahaya)

Description

Selenicereus megalanthus, commonly known as yellow pitahaya or yellow dragon fruit, is a climbing cactus with a thin, wavy stem covered in short spines. It produces one of the most prized fruits in the genus: a yellow-skinned pitahaya with white, sweet, and juicy flesh, filled with tiny black seeds.

This species is a slow grower, but once mature, it can yield abundant fruit. Its large, white nocturnal flowers release a strong fragrance that attracts pollinators such as bats and moths.

History and Origin

Native to South America, particularly the Andean regions of Colombia, Ecuador, and Peru, Selenicereus megalanthus belongs to the Cactaceae family. Unlike the red-skinned dragon fruit varieties (Hylocereus spp.), this species thrives at higher altitudes and has a longer ripening period.

Historically, yellow pitahaya was a valuable food source due to its high water content and sweet flavor, and it was also used in traditional remedies to aid digestion.

Care

• Light: Prefers full sun or partial shade, especially in warm climates. In intense sunlight, some shading may be necessary to prevent stem burns.
• Temperature: Best suited for warm and tropical climates, thriving in temperatures between 15-30°C (59-86°F). It does not tolerate frost, so in colder regions, it should be grown in pots and brought indoors during winter.
• Soil: Requires well-draining, nutrient-rich soil. A mix of cactus soil with sand and peat works well.
• Support: As a climbing plant, it needs structures like poles, trellises, or fences for proper growth and support.

Fun Fact

The name "megalanthus" means "large flower," referring to its massive nocturnal blooms, which can exceed 30 cm (12 inches) in diameter—among the largest in the cactus family.

Unlike other dragon fruit varieties, the yellow pitahaya is considered the sweetest, with a flavor reminiscent of honey and kiwi.

Watering

• Moderate watering, avoiding waterlogging. Water when the topsoil feels dry.
• During flowering and fruiting, increase watering while ensuring proper drainage.
• In winter, reduce watering to prevent root rot.

Pruning

• Structural pruning: To guide growth and encourage branching.
• Maintenance pruning: Remove dry, damaged, or tangled stems to improve air circulation and prevent pests.
• Flowering pruning: Pinching back stems can stimulate more flower production and fruiting.

Selenicereus megalanthus is an exotic, resilient plant with high ornamental and agricultural value. It thrives in warm, tropical climates, producing delicious fruit and stunning flowers throughout much of the year.