From what I have looked up and read grafting dragonfruit should be similar to grafting other cacti. This guide I found a while back was pretty good;

http://faculty.ucc.edu/biology-ombrello/POW/grafted_cacti.htm

Btw, you can experiment with other cacti as grafting rootstock for it as well. Some of the Cereus cacti may make great rootstock as well. Simon you may find this website for grafting cacti very useful http://www.kadasgarden.com/Cgraftingstocks.html .

That's a new technique to me. I will have to try it when mine are older to see what happens.

Here is a good video for grafting cacti.
http://www.youtube.com/watch?v=-GWDXJuLccg
Grafting yellow onto undatus might be a good idea? They tend to graft those funky neon cacti onto undatus cacti to help them grow so why not something even closer in relation? Please keep us updated on your success.

-Ethan

Thanks for the links! My yellow DF is doing horrible right now so I'm going to wait untill I have more branches to work with before attempting to graft it. I will likely wait until Spring before attempting a graft.
Simon

Simon,

Is the yellow in the ground or in a pot? My yellow is doing pretty well in a pot, I am surprised you are having a hard time with it down in San Diego. One thing I did notice about the yellow, is its preference for indirect light and dappled shade (more so then the other dragon fruit).

Hey nullzero, my yellow DF cutting is in a pot along with a Halley's Comet and Frankie's red cutting. They have been growing in the pot for about 18 months and there are tons of weeds growing in the pot also. The Halley's Comet and Frankies Red are growing fine (all things considered) and the yellow is the only one not doing so well. They are in full sun and my Frankie's Red and Yellow DF were the only DF varieties I have that didn't burn during the hot spell we had about 2 weeks ago.

Frankies Red is supposed to be a hybrid between a Yellow DF and a Red fleshed DF variety, that may explain why it may have a higher tolerance for strong direct light. Everything I've read says that Yellow DF likes strong direct sunlight but the small portion of my Yellow DF that is partially shaded is the only area that is green (instead of yellowing) and the shaded area is actually sprouting a very healthy green new branch! When the new branch grows larger, I will re-plant it in a new pot and grow it in a shaded area.
Simon