Cactus
Dragon Fruit (Pitaya)
Hylocereus undatus (syn. Selenicereus undatus) · Cactaceae
Also called: Pitaya, Pitahaya, Strawberry pear, Night-blooming cereus
Dragon Fruit (Pitaya) (Hylocereus undatus (syn. Selenicereus undatus)) is a low-water cactus well suited to Tucson and the low desert. It's a fast-growing cactus.
Dragon Fruit (Pitaya) at a glance
- Water use
- Low (established)
- Sun
- Bright light but NOT full low-desert sun — provide afternoon shade or filtered/dappled light (e.g., 30-50% shade cloth) in Tucson. Full summer sun causes severe sunburn/yellowing of the green stems.
- Mature size
- Climbing/sprawling epiphytic cactus with 3-sided fleshy stems; reaches 10-20 ft, must be supported on a sturdy post/trellis with a top frame to support the heavy crown.
- Growth rate
- Fast
- Bloom
- Large white (sometimes cream) fragrant night flowers; fruit bright pink/red skin with white or red flesh., Spectacular large white night-blooming flowers in summer (each lasts one night); fruit follows in summer-fall. Many varieties need cross-pollination — hand-pollinate flowers at night for reliable fruit set.
- Cold hardiness
- Frost-sensitive; damaged below ~32-40°F and killed by hard freeze. In Tucson protect from frost with cloth, grow under cover/eaves, against a warm wall, or in a container moved to shelter in winter. Also vulnerable to extreme heat (>100°F) and sunburn.
- Soil
- Light, very well-drained soil — a cactus/citrus mix with added organic matter and perlite; as an epiphyte it dislikes heavy, waterlogged soil. Slightly acidic to neutral preferred; grows well in containers in Tucson.
- Native range
- Native to Central America / southern Mexico and the Caribbean (tropical Americas).
- Best used as
- Edible fruit, Ornamental/novelty cactus, Container/patio plant, Night-garden interest (fragrant night blooms)
- Wildlife
- Night-blooming flowers are pollinated by moths and bats in habitat; in Tucson hand-pollination is usually needed for good fruit.
- Toxicity
- Fruit edible and non-toxic to people and pets. Stems are spiny/can irritate. Not poisonous.
How to grow Dragon Fruit (Pitaya) in Tucson & the low desert
Watering
Water like a thirsty cactus: keep soil lightly moist in the warm growing season (roughly weekly, more in extreme heat), letting the surface dry between waterings; cut back sharply in winter. It needs more water than desert cacti but rots if overwatered or poorly drained.
Fertilizer & nutrients
Feed during the warm growing season (spring-fall) with a balanced or low-nitrogen cactus/bloom fertilizer every few weeks; avoid feeding in winter. Light, frequent feeding supports flowering and fruit.
Pruning & care
Prune to manage size and encourage branching once the plant reaches the top of its support; remove damaged or excessive stems for airflow. Train the main stem up the post, then let it branch and cascade from the top.
Notes
Classified as Cactus (epiphytic climbing cactus). In Tucson it is best grown as a container or sheltered specimen on a sturdy support, given AFTERNOON SHADE to prevent sunburn, and PROTECTED FROM FROST in winter. The two big local failure modes are sunburn from full sun and freeze damage in winter.
Sources: Arizona-Sonora Desert Museum / cactus horticulture references; University of Arizona Cooperative Extension; University of Florida/IFAS pitaya production guide (regional reference)