On the market there are a few different tools to make this pots, this is an easy way using things you probably already own.
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Regarding setting pot out into the garden without removing the plant, did your answer mean that if you use just the sheet that you used in the demonstration, that the pot would not harm the growth of the plant?
If you have a tray with holes in it, place a rectanglar piece of heavy plastic inside the tray base before putting your pot plants in the tray. Make sure the water will overflow at about 20 mm so the plant does not get too much water.
We do this with native trees in New Zealand that require watering from underneath. They never dry out. Maybe you could try this.
These are very quick to make...