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A dragon fruit, also known as pitaya or pitahaya, is the fruit of several cactus species, most importantly of the genus Hylocereus (sweet pitayas). These fruit are commonly known as "fire dragon fruit", "dragon pearl fruit", or Vietnamese thanh long (green dragon). Other vernacular names are strawberry pear or nanettikafruit. In Mauritius, it is known as "Débousse-to-fesse" because of its laxative properties.

Native to Mexico and Central and South America, the vine-like epiphytic Hylocereus cacti are also cultivated in Southeast Asian countries such as Taiwan, Vietnam, Thailand, the Philippines, Sri Lanka and Malaysia. They are also found in Okinawa, Hawaiʻi, Israel, northern Australia and southern China. Hylocereus blooms only at night; the large white fragrant flowers of the typical cactusflower shape are among those called "moonflower" or "Queen of the Night". Sweet pitayas have a creamy pulp and a delicate aroma.

If not otherwise stated, this article's content refers specifically to the pitayas of Hylocereus species, or "dragon fruit".

Stenocereus fruit (sour pitayas) are of more local importance, being commonly eaten in the arid regions of the Americas. They are sourer and more refreshing, with juicier flesh and a stronger taste, and are relished by hikers. The common Sour Pitaya or pitaya agria (S. gummosus) in the Sonoran Desert has been an important food source for Native American peoples. The Seri people of northwestern Mexico still harvest the highly appreciated fruit, and call the plant ziix is ccapxl – "thing whose fruit is sour". The fruit of related species, such as S. queretaroensis and Dagger Cactus (S. griseus), are also locally important food. Somewhat confusingly, the Organ Pipe Cactus (S. thurberi) fruit (called ool by the Seris) is the pitahaya dulce ("sweet pitahaya") of its native lands, as dragon fruit are not grown there in numbers. It still has a more tart aroma than Hylocereus fruit, described as somewhat reminiscent of watermelon; it has some uses in folk medicine.

Fruits of some other columnar cacti (mainly Cereeae) are also called "pitayas" – for example those of the Peruvian Apple Cactus (Cereus repandus).

After thorough cleaning of the seeds from the pulp of the fruit, the seeds may be stored when dried. Ideally, the fruit must be unblemished and overripe. Seeds grow well in a compost or potting soil mix - even as a potted indoor plant. Pitaya cacti usually germinate between 10 and 14 days after shallow planting. As they are cacti, overwatering is a concern for home growers. As their growth continues, these climbing plants will find something to climb on, which can involve putting aerial roots down from the branches in addition to the basal roots. Once the plant reaches a mature 10 lbs weight, one may see the plant flower. Pitaya cacti flower overnight, usually wilting by the morning. They rely on nocturnal creatures such as bats or moths for fertilization by other pitaya. Self fertilization will not produce fruit. This limits the capability of home growers to produce the fruit. However, the plants can flower between three and six times in a year depending especially on growing conditions. Like other cacti, if a healthy piece of the stem is broken off, it may take root in soil and become its own plant. This is a much shorter route to reproduction. The plants handles up to 104oF and very short periods of frost, but do not survive long exposure to freezing temperatures. The cacti thrive most in USDA zones 10-11, but may survive outdoors in zone 9a or 9b.

Hylocereus has adapted to live in dry tropical climates with a moderate amount of rain. The dragon fruit sets on the cactus-like trees 30–50 days after flowering and can sometimes have 5-6 cycles of harvests per year. There are some farms in Vietnam that produce 30 tons of fruit per hectare every year.

Sweet pitayas come in three types, all with leathery, slightly leafy skin:

    * Hylocereus undatus (Red Pitaya) has red-skinned fruit with white flesh. This is the most commonly-seen "dragon fruit".
    * Hylocereus costaricensis (Costa Rica Pitaya, often called H. polyrhizus) has red-skinned fruit with red flesh
    * Hylocereus megalanthus (Yellow Pitaya, formerly in Selenicereus) has yellow-skinned fruit with white flesh.

Early imports from Colombia to Australia were designated Hylocereus ocampensis (supposedly red fruit) and Cereus triangularis (supposedly yellow fruit). It is not quite certain to which species these taxa refer to, though the latter is probably the Red Pitaya.

The fruit can weigh from 150-600 grams; some may reach one kilogram. The flesh, which is eaten raw, is mildly sweet and low in calories. Few people find its taste offensive; some may consider it bland. It is generally recommended that dragon fruit be eaten chilled, for improved flavor; dragon fruit should not be used to accompany strong-tasting food – except to "clean the palate" between dishes. The fruit is also converted into juice or wine, or used to flavor other beverages. The flowers can be eaten or steeped as tea.

To prepare a pitaya for consumption, cut the fruit vertically into two halves. From here, either cut the halves into watermelon-like slices, or scoop out the two white fleshy halves with a tablespoon. Eating the fruit is sometimes likened to that of the kiwifruit due to a prevalence of sesame seed-sized black crunchy seeds found in the flesh of both fruits which make for a similar texture upon consumption. Although the tiny pitaya seeds are eaten with the flesh, have a nutty taste and are rich in valuable lipids, they are indigestible unless chewed. The skin is not eaten, and in farm-grown fruit it may be polluted with pesticides.

Ingestion of significant amounts of red-fleshed dragon fruit (such as Costa Rica Pitaya) may result in pseudohematuria, a harmless reddish discoloration of the urine and faeces.
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Quick Tip by . August 21, 2009
I love the name of this fruit, as well as the aesthetics; it's hot pink with some green, and the inside is white with black polka dots!
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