Help, which way is up with yellow pitaya cutting?

Good morning... I am rather new to pitayas, but I just got several cuttings. The vietnamese and a few others have undulations that make the planting direction very clear, but the yellow type does not. I tried to compare the spines to the undulated type, but they are also less defined on the yellow. The problem is that they aren't cuttings from the base of new growth, but instead, are cut on both ends. I doubt that they will root if they are planted the wrong way. I thought about planting them horizontally... but if anyone here has a good link to pictures of different cutting s in their proper direction it would be helpful.
Thanks to all

The following thread was started by William (Los Angeles) on November 07, 2009 at 8:48 am PST

withought knowing wich side is up i would say either plant it horizontally or if the cutting is long enough cut it in half than plant both of the original ends in the soil. hopefully the person that sent the cuttings would have though about maybe cutting the top flat and the bottom at a slant that way you could identify up from down but the few times i have recieved cuttings i had enough to cut and plant both sides because they where just cut off but had enough to cut and plant like 6 or so from each cutting

The above followup was added by mikeyinfla on November 08, 2009 at 9:13 am PST.

Cactus are so easily rooted, and such survivors. And dragon fruit especially being epiphytes, always sending roots out from everywhere. Theyll grow no matter what.

The above followup was added by Brendan on November 08, 2009 at 11:11 am PST.

if you have room lay it on its side, if you are unsure, plant it. Usually you will get more growth from the soil level if it is planted upside down, when they are planted properly often growth will start from the top of the cutting.

good luck,
-Ethan

The above followup was added by Ethan on November 09, 2009 at 8:16 am PST.

Most of the needles on my yellow pitaya are pointing up, for what it's worth. It is a small plant that was already rooted when given to me two months ago. The new growth is easier to spot needle direction than old, so that may not do you much good.

I was also unsure of some other cuttings and experienced growers also suggested planting them on their side, but I ended up figuring out which way was up (someone at Irvine had made some conflicting comments about angled cuts on the top instead of the bottm, but that got cleared up).

Good luck!

The above followup was added by HarveyC on November 12, 2009 at 11:24 am PST.