Clay Pebble Drainage Layers
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Adding a layer of clay pebbles at the bottom of a pot is one of those habits carried over from houseplants that does nothing useful here. It raises the saturated zone rather than lowering it, and the container setup notes on https://kushindicaseeds.com recommend filling with medium throughout instead. Drainage holes and a fabric pot do the actual work. If water sits after a feed, the problem is pot size or watering volume.