Osmotic stress is when a plant has trouble taking in or holding onto water because the surrounding soil or potting mix has too many dissolved substances, like salts or fertilizer. This imbalance pulls water out of the plant’s cells instead of letting it move in normally.
For indoor and outdoor plants, this often shows up after overfertilizing, using hard water, or letting soil dry out too much. Plants may wilt even when the soil looks moist, and leaf tips can turn brown or crispy. Growth usually slows as the plant struggles to stay hydrated.
Osmotic stress is different from simple underwatering because water may be present, but the plant cannot use it effectively due to the chemical conditions around the roots.
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