YouTube - HOMEGROWN How To: How to Make A Self-watering (or Sub-irrigated) Garden Container for Cheap

Between this glorious site and you tube anything is possible... this link is a good idea and if you cut your drain holes bigger im sure your water will be wicked up by your potted dirt but i don't think it would be a good idea with root rot. A timer and and water pump would prolly be a better idea if you could rig up two timers so on if one of them only clicks a few hours. I think i just came up with next weekends project.