Sometimes it can be difficult to track whether a plant has had too much or too little water.Visual signs, such as shrivelling or browning leaves, don't start until most of the plant's water is gone, while yellowing takes place after it has been drenched.To address this tricky dilemma, scientists have created a new 'smartwatch for plants', which monitors the water content in leaves and pings the owner when the plant is in need of a drink.
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