These cactus are native to Mexico, Central and South America but are now grown commercially throughout Southeast Asia, southern China and northern Australia and Hawaii, but particularly in Vietnam. In Southern California the fruit is most commonly found in Asian markets - and in other parts of the country it is found in expensive gourmet restaurants.
There are other Hylocereus species which produce similar fruit, particularly H. costaricensis (Costa Rick Pitaya) which is red with red flesh and H. megalanthus (Yellow Pitaya), a South American species that produces a yellow fruit with white flesh.
More on Cactus.
The photo shows several dragon fruit cacti growing in a commercial plantation, probably in Vietnam. The fruit at the ends of the fronds is still green and very immature. Photo © i0110.
This South American Dragon Fruit species has started to appear here in
Los Angeles (late 2018). The taste and texture is much like the Red
Pitaya. The seeds are larger, but I do not find that a problem. The
uncut photo specimen was 4.1 inches long, 3.3 inches diameter, and
weighed 12-1/4 ounces. It was purchased from a large Asian Market in
Los Angeles (San Gabriel) for 2018 US $7.99 / pound.
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