Q.Outdoor potted plants
How often must the soil be replaced in an outdoor potted plant?
Downtoearthdigs
Answered on February 6, 2016
Every year or two you should replant the plants in fresh potting soil to ensure a steady stream of nutrients.
If the plants roots are growing in circles, your plant will need a larger pot.
Succulents and cactus grow much more slowly and can go longer before repotting.
If the plants are fast growing, they may need larger pots more often.
A general rule is to go up 1" in pot size.
https://www.gardeningknowhow.com/plant-problems/environmental/root-bound-symptoms.htm
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