Fruit & Fruit Trees

If you have enough light inside the apartment, you can put the whole dragonfruit cactus in a pot with a trellis in it and bring that indoors for the winter. You could prune the dragonfruit to whatever size you need, which encourages the formation of branches anyway. Each branch can produce one fruit, so you want as many branches as possible. The trellis should be shaped to encourage horizontal growth, so something like a vertical post with wheel-like spokes radiating out at the top would work.