Our neighbor used his chain saw and we used a hammer and chisel to hollow out this old stump. Then I drilled drainage holes from the bottom and inside walls to the outside. You'll find more detail on how this was done at the "Bird Bath" photo. I had previously discovered that the decomposing wood of the stump would be a detriment to the growth of any herbaceous plants I would set in the hollow because of the microorganisms responsible for decay extracting nitrogen meant for my flowers from the soil and using it carry on their life processes. To reduce this effect, I lined the hollowed out stump with 2 layers of black plastic leaf bags and punched holes to correspond to the drainage holes. I selected an aggressive species - Snow-in-Summer (Cerastium tomentosum) - and enriched the soil with alfalfa pellets. The result is that the Snow-in-Summer "behaves" itself, growing low and compact, and the drought-tolerant nature of its gray-green leaves means I almost never have to water this planter.