I've had a few dragonfruit plants over the past decade. Super easy to propagate, just stick approx 1" cuttings into good soil.
My biggest was almost 4 feet tall and the thickest stem had a diameter of almost 2 inches. I was sad when I lost that one, but I was able to save a few cuttings of it.
Good plant to move in and out as the seasons change, but it does have very small thorns so I try to be very careful when moving it.
Sadly I'll never get fruit