It not known exactly where the dragon fruit originated, but it is thought to have come from South America. The French are believed to have brought the dragon fruit to Vietnam over a hundred years ago. Dragon fruits were grown there to be eaten by royalty and very wealthy families. Now, the fruit flourishes in American states such as Texas, and is also grown in Mexico and other South American countries such as Argentina and Peru.
The plant of the dragon fruit can grow from around a few inches or centimeters to up to twenty feet (around six meters). It flourishes in hot regions with a heavy rainfall. Periods of cold will kill the plant, and it loves the high temperatures found in tropical countries.
The flowers of the dragon fruit plant only bloom at night and usually only live for one night. Pollination happens at this time to allow the fruit to emerge. The flowers of the dragon fruit give out a very beautiful scent, and the smell can fill the night air wherever the plant grows.
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 "dragonfruit".
Hylocereus megalanthus (Yellow Pitaya) has yellow-skinned fruit with white flesh.
The fruit can weigh from 150-600 grams and the flesh, which is eaten raw, is mildly sweet and low in calories.
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. The skin is not eaten.
The flowers can be eaten or steeped as tea.
Although the tiny pitaya seeds are eaten with the flesh, the seeds are indigestible. It is generally recommended that dragon fruit be eaten chilled, for improved flavor.
Ingestion of significant amounts of red dragonfruit (particularly Costa Rica Pitaya) may result in a reddish discoloration of the urine and faeces.