Step 3: Preparing To Plant
Fill the tube with more drainage material.
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You will find that by adding drainage material that you are effectively reducing the size (volume) of your container, and effectively raising the water level that the soil holds. The equilibrium between capillary action (up) and gravitational flow (down) in the soil remains the same, just now in an effectively smaller container.
Just a tip. You don't need a hole/tube in the middle of a pot if your soil characteristics promote drainage.