Here is one that my wife used for an orchid. I finished the inside with Spar varnish. The is also a plastic liner/pot I think. The natural cracks at the bottom allow the water to escape as well. Not sure how long it will last. But hey, it is called "wu" - which means nothingness, the primordial void, among other things... so if it decays after a few years, such is life - it was going to end up in the firewood pile or shredded into wood chips anyway so at least it got a few moments in the light.