some one gave us a cutting last year, have it growing up an oak tree. did a bunch of cuttings this spring. was on tropical forum and it looks alot like what they are picturing.
To the people that would like to grow the Dragon Fruit (Pitaya) in zones that would have frosts, I suggest and use this method. I nail a 5 gallon plastic pot (4 gallons actual)to the base of a 4X4 post using the long roofing nails. The post length I use is 5 foot (a 10 foot 4X4 cut in half). You can cut whatever length you choose to make your 'tree' the height you'd like. On the top of the post I nail a 3 or 4 foot long board or a 2X4 to make a 'T' post to support the branches. Plant your Pitaya in your soil mix and let it grow up the timber pole, when it gets to the top, trim it so it will send side branches out and look like a palm tree fronds hanging from the upper cross member. This also makes the fruits easy to reach. In the pot at the bottom you can put small flowering annuals to dress up your pole bucket. When you get frost warnings the pot & post can be brought inside for the night to protect it(if you didn't make it too tall). I cannot take a picture because a cat climbed the pole and knocked the whole dang thing over. I'm in process of a do-over with a Christmas tree stand type X under my pot to firm it up better.