i dont use the pole for the vanilla- that grows out of a tub terrarium and freely up my patio screen
i use the poles for indoor plants like monstera and philodendron that like to climb- i fill it with mostly lava rock and some mulch and wrap the out side in hygrolon - i pour water on it weekly but it is mostly dry as Ray pointed out. i like that it gives REALLY good anchoring for the climbing roots and i can water the pole easily with a quick mist and not worry about sogging down the soil.
keep in mind that i am in a humid area and i get a lot of forgiveness by the plants from that
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