Modular Moss Pole

Pothos plants get really big when the have something to climb on and sink their roots into - this fits the bill. You stuff it with moss and bury it in your pot. At the top, there's a water reservoir, you use a length of cord to make a wick so the water can slowly drain from the reservoir to moisten the moss. You can snap on more segments as the plant grows, and there's holes for zip tying to a stronger support. Or, you can propagate the plants just by breaking the pole in half - it will be rooted into the moss, it won't have any problems.