I bought rubber and cork stoppers at Home Depot. The cost a buck or two depending on the size. The water does not come rushing out as fast and I believe it is an improvement. I also tried jamming large chunks of mulch in the holes. Consider that I have twenty 20 gallon containers and one 15 gallon container, I have spent almost as much on stoppers as I did on the containers but they are reusable. I just bought another 9 rubber stoppers that I will be using in the next day or so.
I should add that I am using Miracle Grow potting mix and a good layer of red mulch.
Hope this helps. Good luck with you gardening!
-Howard
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