good idea if you are worried about deep roots not getting enough water. great way to reuse plastic bottles if you have to but not sure id want to put plastic in my soil at the same time...:

Tomato plants like deep watering. Why waste water when you can make a simple reservoir delivery system. The photo says it all. Tomato plants like deep watering.

03. coffe-filter

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30 Insanely Clever Gardening Tricks is Keep soil from leaking out of your pots’ drainage holes with coffee filters.