Markjump wrote:
This plant grows quite well, but why the white colour appears on the
pot?
How to remove it?


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It is dissolved salts that have gone through the porous pot and then dried
out. This could be from fertiliser or from the soil in the pot or both.
You can sit the pot in a tub of water and scrub it with a stiff brush. OTOH
you can use non porous pots or just put up with it.

David