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Not only do plants need enough water and nutrients from fertilizers, plants also need oxygen. But not only above ground, but also the roots have to get enough oxygen. And therefore you have to Flower pots holes to have.
Unfortunately, this is not always the case. For example, in the clay pots that you like to put on the terrace or in the garden. Without drain you should not set up these pots. So it's best to pay attention when buying.
Even drill a hole in the flower pot
Unfortunately, such pots are offered again and again without said holes. Then you have to manage yourself. Turn the empty pot over and carefully drill a hole in it. So the irrigation water can flow away, does not build up, the roots get air and the plant does not start to rot.
Alternative clay beads
Under the pot you can then put a coaster, for example, if you do not come daily for pouring. This allows the plant to serve itself for a few days. What else you can do: Lay out the pot with foil and bring down clay balls that store the water. Then only the earth on it. Better is the variant with the hole.