Several years ago I planted a Green Dragon cactus from a co-workers cuttings. I also got to taste the fruit. It was delicious. I noticed that it is also sold at some grocery stores at quite a high price that didn’t seem worthwhile to me. Unfortunately my climate is just slightly too cool for my plants to survive the winter since we usually get some below freezing nights each winter. I found that I could grow it in secluded spots that are slightly warmer but it doesn’t seem to get enough sunlight there. It also required more water than I’d like to give it. I’ve been quite disappointed.
Around the same time, I planted another couple cuttings of another cactus called cereus peruvianus, as best as I can tell. It’s quite common the yards in our area and certainly tolerates cold and drought. It appeared to be related to dragon fruit and I had hopes that it would be edible. Finally, after about 4 years of waiting for the plant to be able to produce fruit, I finally got my first taste. Wow! It was very similar in taste to dragon fruit. It had white flesh with little black seeds. No thorns on the outside of the fruit (unlike opuntia fruits which taste good too). I must say this was a very pleasant surprise.
Now I expect to get several fruits each year with very little or no water as an input cost. The plants get quite large and given the rather low fruit output as well as the limited space I have for planting, I’m not sure that I’m going to plant very many.