This is a dragon fruit. 
This fruit grows on a cactus. 

Pitaya is a fruit that grows on a cactus. 
There are different kinds of pitaya. Some have pink skin and white flesh. Others have red skin and red flesh. Some even have yellow skin with white flesh. The red color comes from betalain. This is a natural pigment, or color maker. 
These cacti are climbing plants. They use roots to hold onto things. The flowers bloom only at night. They wilt by the next evening. Because they bloom at night, they need special help. Bats and moths visit the flowers to help them make fruit. 
Farmers grow pitaya in many warm places. It grows in places like Mexico and Vietnam. It also grows in Australia and Brazil. The fruit is mostly water. It is a very juicy snack.
Pitaya is a tasty fruit that comes from special types of cactus. 
Growing this fruit is a very interesting thing that happens. The pitaya plant is a climbing cactus. It uses roots to hold onto things as it grows upward. 
People have known about these fruits for a long time. Pitaya is native to southern Mexico and parts of Central America. This includes places like Guatemala, Costa Rica, and El Salvador. 
There are several different varieties of this fruit to learn about. 
Eating pitaya is a fun experience for many people. The texture is a lot like a kiwifruit. This is because it has many small, crunchy black seeds.
Pitaya is a unique fruit produced by several species of cactus. 
The way these plants grow is quite specialized. Pitaya cacti are climbing plants. As they grow, they look for something to climb on. They use aerial roots to hold onto structures. They also use basal roots in the soil. To produce fruit, the plant must first reach maturity. This can take up to 60 months, or about 260 weeks. Once mature, the plant can flower between three and six times per year. The flowers are very special because they bloom overnight. They usually wilt by the following evening. This timing means they rely on nocturnal pollinators. Animals like bats or moths visit the flowers at night to help with fertilization. 
There are different types of pitaya based on their genus. The term pitaya often refers to the genus Stenocereus. These are often called sour pitayas. They are common in the arid regions of the Americas. The Seri people of northwestern Mexico harvest a variety called pitaya agria. They call the plant ziix is ccapxl, meaning "thing whose fruit is sour." Other species like the organ pipe cactus produce the pitaya dulce, or sweet pitaya. In contrast, the name pitahaya or dragon fruit usually refers to the genus Selenicereus. 
Within the Selenicereus genus, there are three main varieties of sweet pitaya. The first is Selenicereus undatus. This is also called pitaya blanca. It has pink skin and white flesh. This is the most common dragon fruit seen in markets. The second type is Selenicereus costaricensis. This is known as pitaya roja. It features red skin and red flesh. The third type is Selenicereus megalanthus. This is called pitaya amarilla. It has yellow skin and white flesh. Most of these fruits weigh between 300 and 600 grams. However, some large fruits can reach 1,000 grams. 
Scientists study the pigments that give these fruits their color. The red flesh in the red pitaya contains a pigment called betalain. This is also known as betacyanin. This is the same family of pigments found in beets and Swiss chard. The white-fleshed varieties do not have this color compound. Red pitaya also contains a higher level of polyphenols than the white variety. These pigments are important for the fruit's appearance. They also influence how the fruit is used in food and drinks.
Growing pitaya requires careful management of water and environment. Because they are cacti, overwatering is a major concern. Too much water or excessive rain can cause flowers to drop. It can also cause the fruit to rot. The plants can handle temperatures up to 45 degrees Celsius. They can also survive short periods of frost. However, they cannot survive long periods of freezing temperatures. They grow best in USDA zones 10 to 11. In some areas, these cacti have escaped farms. They have become invasive weeds in certain countries.
Humans use pitaya in many culinary ways. The texture is often compared to kiwifruit. This is because of the many small, crunchy black seeds inside. The fruit is composed of 84% water and 15% carbohydrates. The seeds also contain oil rich in linoleic acid. People use the fruit to color and flavor juices. Some drinks even use names like "Dragon's Blood Punch." You can even eat the flowers or use them to make tea. This makes the entire plant useful for food and drink.
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