How can I kill a plant by overwatering it, yet propagations of the same plant will grow in water?
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Roots need oxygen. Overwatering in a pot displaces the oxygen in the spaces of the soil by oversaturation of the water table.
Oxygen exchange improves as the water surface is increased (like in a jar) and with agitation. In a regularly changed jar of water the plant will have better oxygenation at the root zone compared to an overwatered pot with low drainage.
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