I think that if you can't see any holes in the bottom of the planter, you'd better drill a few! Some planters come with a mesh screen that holds the potting soil above the bottom of the pot, and water drains down into the bottom and pools there. Having a reservoir of water in the bottom of the pot does mean that you don't need to water so often, but it also makes it very easy to overwater and get waterlogged soil.
