When you should change the soil? . Root Bound

A potted plant you buy at a garden center may look fine but if you take a close look, it is not unusual for the roots to be densely packed in the container. The plant is what’s referred to as root-bound or pot-bound. This is a problem that needs to be corrected before planting; otherwise, the root-bound plant just keeps growing its roots in a tight circular fashion and never sends those roots out into the surrounding soil. The plant’s growth becomes stunted because it never fully established itself and in the worst case, it will eventually choke itself.

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Good job