To create your own bougainvillea trellis, we recommend using wood or woven-wood. The reason we suggest wood is because a metal trellis will get very hot and stunt the growth of the bougainvillea. Remember, bougainvillea need lots of sunlight. Sunlight on metal = hot.
That's it! Bougainvillea are vine and will use the trellis you provide it to encroach and grow. Bougainvillea can grow from 1 - 12 meters tall. The time it takes to make a bougainvillea trellis all depends on how tall of a trellis you are making, the time of year, the variety, AND the quality of care and maintenance that you give it.
To make them flower all along the trellis, just remember to trim/pinch after each bloom cycle all along the plant and not just at the top.
Consider using BOUGAIN®, a specially formulated bougainvillea fertilizer.