They provide support for epiphytic plants to grow upwards. The aerial roots of vining species can easily attach to the fibrous material, securing the plant and encouraging its growth.
They can supply moisture to the plant. Moss poles are always made with a water retentive material, so watering/spraying the pole will allow it to store some moisture for the plants’ aerial roots to access.
They often help plants progress through to maturity. Taller plants think they’re closer to the sunlight at the top of the rainforest canopy and make changes to capitalize on that. Potentially leading to larger plants, larger leaves, fenestrations and more
They’re a space-efficient solution. I get it, we’re all low on counter space for new plants, but climbing plants can be trained to occupy vertical space instead of horizontal.
They can make unruly plants look really good. We’ve all got that one vining species that looks like all stem and no foliage sometimes. By integrating the stem of the plant with the central pole, it visually removes the stem and highlights the foliage.