I have 2 dragon fruit (pitaya) growing under a large 30-year-old mesquite tree. The mesquite tree is dripping sap at the base of one of the dragon fruit plants. This plant is a deep green healthy color. The other plant (which does not have sap dripping at its base) is pale green and does not look as healthy.
Is it possible that the sap from the mesquite tree is providing nutrition to the dragon fruit and if so what is it in the sap that's doing this?
Not sure if this image of the two plants is sufficiently clear to show the distinction. The one on the left has the sap dripping to its base which you might be able to make out in the photo.
More info: They are two different types of Dragon Fruit. One is white and the other red although neither have produced fruit to date. I also don't know which one is which.