I use 4 inch white tile in several of my containers as mulch because I have it available. 4 inch would probably be too big for 5 gallon. I also use 2+ inch river rock in many others. I prefer the look of the river rock. I debate the best color to use. Early in the season black would be best and later lighter colors but I don't want to change mid season.
Some of my containers have larger tile outside to reflect heat and help to keep the roots cool.
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