How often should I water Hylocereus undatus?

Water thoroughly when the soil is dry, typically every 1-2 weeks in warm weather and less in cooler periods. Avoid waterlogged soil.

What kind of soil does it need?

It prefers well-draining soil, such as a cactus or succulent mix, with good aeration.

Does it need full sun?

It thrives in bright, indirect light or partial shade; intense, direct sun can scorch the stems.

When does it flower and fruit?

Flowering typically occurs in summer, with fruit developing shortly after. The flowers open at night.

How do I propagate it?

Propagation is commonly done through stem cuttings, which root easily in well-draining soil.

Plant guide

Dragon Fruit.

Hylocereus undatus

Pronounced hy-LOH-ser-ee-us un-DAY-tus

Also known as Belle of the Night, Nightblooming cactus, Strawberry Pear, belle-of-the-night, dragon-fruit, moonlight cactus, night-blooming cereus, queen-of-the-night

Dragon fruit is a striking tropical cactus known for its vibrant, scaly exterior and speckled, edible flesh. It's a fast-growing vine that requires support to climb. This plant is primarily grown for its delicious and nutritious fruit.

At a glance

Care level: Moderate
Plant type: Cactus, vine
Light: Full sun to partial shade
Indoor light: bright-indirect
Water: Every 7 to 14 days
Mature size: Vining, can reach 10-20 feet in length
Growth rate: fast
Hardiness: USDA 10 to 12
Bloom time: Summer to fall

Care

Provide a sturdy trellis for support as it's a vining plant. Protect it from frost and ensure good air circulation to prevent fungal issues. Prune to manage size and encourage fruiting.

Watering: Water thoroughly when the top inch of soil is dry, allowing excess water to drain. Reduce watering in cooler months.
Feeding: Feed with a balanced liquid fertilizer diluted to half strength during the growing season (spring through fall).
Pruning: Prune in late winter or early spring to remove dead or overcrowded stems and to shape the plant. Pinching back growing tips can encourage branching.
Repotting: Repot when the plant becomes root-bound, typically every 1-2 years, using a well-draining potting mix.
Soil: Well-draining cactus or sandy loam soil
Soil pH: 5.5 to 7.0
Temperature: 10 to 35°C
Humidity: 50 to 70%
Drought tolerance: moderate
Lifespan: Perennial, can live for many years with proper care
Fragrance: strong
Deer and rabbits: high

Signs it needs repotting

Roots growing out of drainage holes.
Water drains very slowly or not at all.
Plant appears top-heavy and unstable.
Growth has significantly slowed or stopped.

Safety

People: The plant itself is not considered toxic to humans, but the fruit is the primary edible part.
Pets: Non-toxic to cats and dogs.
Children: The spines can be sharp, so supervise young children when handling or near the plant.
Contact allergens: No significant contact allergens are noted for this species.
Airborne allergens: Pollen may cause mild respiratory irritation in sensitive individuals.
Edibility: While the fruit is edible, ensure the plant has not been treated with pesticides or other chemicals.

How to identify it

Vining cactus
Three-sided stems
Large, nocturnal white flowers
Fleshy, colorful fruit
Scaly, dragon-like skin

Height: 3 to 6m
Spread: 0.3 to 0.9m
Leaves: Green, evergreen
Flowers: White, 20 to 30cm
Fruit: Pink, Red, Yellow, Summer to fall

Common problems

Rot — Overwatering or poor drainage can lead to root and stem rot, often appearing as mushy, discolored areas.
Mealybugs — These white, cottony pests can infest stems, weakening the plant and reducing fruit yield.
Sunburn — Intense, direct sunlight can cause yellowing or brown scorched patches on the stems.

Growing it

Propagation: Cuttings, Seed
When to plant: Spring, Summer
Overwintering: Protect from frost by bringing container-grown plants indoors to a bright location with reduced watering. In mild climates, ensure it has protection from prolonged cold snaps.
In containers: Grows well in containers, provided they are large enough to accommodate its climbing habit and have excellent drainage; a minimum of a 10-gallon pot is recommended for mature plants.

Stem Cuttings

Take a healthy stem cutting, at least 6 inches long, in spring or early summer.
Allow the cutting to callus over for a few days to a week in a dry, shaded spot.
Dip the callused end in rooting hormone (optional).
Plant the cutting in a well-draining cactus mix, burying the callused end about 1-2 inches deep.
Water sparingly and keep in bright, indirect light until roots form, usually within 4-8 weeks.

Ensure good air circulation around Hylocereus undatus, especially when grown with other plants, to help prevent fungal issues.

Grows well with

Other Cacti and Succulents — These plants share similar needs for well-draining soil and bright light, making them compatible neighbors.
Air Plants (Tillandsia) — Air plants can be mounted nearby, benefiting from the same ambient humidity and light conditions without competing for soil resources.

Keep away from

Overly Wet Soil — Constantly soggy soil is the primary cause of root rot, which can quickly kill the plant.
Frost — This tropical cactus is sensitive to cold temperatures and frost will damage or kill it.

Similar species

Hylocereus polyrhizus — Similar climbing cactus with edible red-fleshed fruit, differing mainly in stem structure and flower characteristics.
Selenicereus grandiflorus — Another night-blooming cactus with large, fragrant flowers, though its fruit is less commonly cultivated.

Science

Family: Cactaceae
Genus: Selenicereus
Order: Caryophyllales
Class: Magnoliopsida
Native range: Southern Mexico and Central America
Conservation: Not currently considered of conservation concern.

As a hemiepiphytic cactus, it grows on trees or rocks in its native habitat, using aerial roots for support and moisture absorption.

Uses: Ornamental, Fruit production

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6.5/9
Light: 7/9
Temperature: 8/9
Moisture: 4/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

How often should I water Hylocereus undatus?: Water thoroughly when the soil is dry, typically every 1-2 weeks in warm weather and less in cooler periods. Avoid waterlogged soil.
What kind of soil does it need?: It prefers well-draining soil, such as a cactus or succulent mix, with good aeration.
Does it need full sun?: It thrives in bright, indirect light or partial shade; intense, direct sun can scorch the stems.
When does it flower and fruit?: Flowering typically occurs in summer, with fruit developing shortly after. The flowers open at night.
How do I propagate it?: Propagation is commonly done through stem cuttings, which root easily in well-draining soil.

Where the name comes from

The genus name 'Hylocereus' comes from the Greek 'hyle' (forest) and Latin 'cereus' (wax candle), referring to its climbing nature and waxy flowers. 'Undatus' is Latin for 'wavy', describing the edges of its stems.

Good to know

The flowers are nocturnal and bloom only at night, often lasting just one evening.
It's a climbing cactus that requires support to grow upwards.
The fruit's flesh can be white or red, dotted with tiny black seeds.
Pollination often requires hand-pollination or specific nocturnal pollinators.

Is your dragon fruit looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.