This is the link to the findings from the University of California Agriculture and Natural Resources Co-operative Extension. 

Rare Dragon fruit is all about education of growing dragon fruit we aim to share as many resources we can on growing dragon fruit so you can make educated decisions on how you choose to grow your own fruit.

There are so many options and ways to grow there is no wrong or right it is what works best for the plants in your area. 

Please take a read and learn something new about dragon fruit and Pitaya

Learn about Dragon Fruit Varieties - 

• Cebra
• Rosa
• Orejona
• Lisa
• Mexicana
• San Ignacio
• Sin Espinas
• Valdivia Roja
• Colombiana
• Bien Hoa Red
• Bien Hoa White
• Delight
• American Beauty
• Haley’s Comet
• Physical Graffiti
• Vietnamese Giant
• Yellow Dragon
• Seoul Kitchen
• Armando
• El Grullo

2013 University of California Pitahaya Production Seminar & Field Day
Link :
https://ucanr.edu/sites/sdsmallfarms/files/172469.pdf