Is it possible to over-water?

Not generally because of the drain at the bottom. All the water (worm tea) collected from the drain should be poured back in when you water your garden tower. However, you should not water more frequently than necessary or you can disrupt the soil and compost ecology.  If your Tower is draining nutrient tea (leachate) more than once or twice per week, we suggest your allow more time between watering.

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