Question

Why does the potted plant die if overwatered

Answer 1

All living things need water to survive and that's for the plants too..

Answer 2

Roots growing in waterlogged soil maydie because they cannot absorb the oxygen needed to function normally. The longer the air is cut off, the greater the root damage. The dying roots decay and cannot supply the plantswith nutrients and water. Damage caused by over watering is frequently misdiagnosed as pest damage.