Overwatering is the condition in which soil or potting mix remains saturated for extended periods, limiting oxygen availability to plant roots. Roots require oxygen for respiration, and prolonged saturation displaces air from pore spaces, leading to stress or decline.
In containers, overwatering is usually caused by watering too frequently relative to the mix’s drying rate, rather than by the volume applied at one time. Fine-textured or compacted mixes, low light (low PPFD and DLI), and cool temperatures all slow water use, increasing the risk of persistent saturation.
Chronic overwatering can lead to root death and opportunistic infections such as Root Rot, while also reducing nutrient uptake. It is distinct from temporary saturation after a thorough watering, which is normal if the mix subsequently drains and re-aerates.
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