Growing dragon fruit on a tree can be a unique and visually appealing approach to cultivating these cacti. However, it requires more attention and maintenance compared to traditional trellis-based cultivation.Be prepared for the possibility of the dragon fruit gradually enveloping the tree as it climbs, which can create a stunning and decorative display.Branches of the dragon fruit plant grow best when they are hanging down. When growing dragon fruit up a tree the hanging branches that produce fruit maybe 20-30 up making it impossible to pick or pollenate. The existing tree will also rob a lot of nutrients from the dragon fruit plant and cause more disease, slower growth and less dragon fruit production. I would not recomend growing dragon fruit up a tree as they get out of control and damage the tree the dragon fruit is climbing.