dwarfing dragon fruit
Is it possible to dwarf the height of dragon fruit and spread the vines on a trellis so it can be grown indoors with plant lights?
Certified GKH Gardening Expert
With aggressive pruning and training, you can help keep it smaller and growing outward instead of up, but this may also affect its ability to fruit. It does not have so much in the way of vines, but rather succulent leaves, so this may be hard to attach to a trellis. It may also be very difficult to get them enough light indoors.
You can easily prune the dragon fruit, also known as Hylocereus and pitaya. Just go ahead and cut the fleshy stems wherever you want. Much more difficult will be giving it enough light to flower and fruit. It will grow as an indoor plant, but flower and fruit requires bright light, at least partial sun. Also, I believe the flowers need to be pollinated from another plant in order to fruit. Here is a rather long article that seems very complete in its information: http://miami-dade.ifas.ufl.edu/pdfs/tropical_fruit/THE%20PITAYA%20in%20Florida.pdf