When you water your container pots, the water not absorbed by the soil mix works its way down to the base of the container. For healthy roots, this excess water must be gotten rid of or the roots will decay. Translation? Bu-bye plant. It was nice knowing you. Most containers do have a hole at the bottom, but if yours doesn't, you'll need to make one. The pot I bought from Wegmans didn't have one, so my husband got to use his power drill. A good thing, because I really like my hibiscus plant.