The PlantWatcher automatic plant watering system automatically waters plants using a special new patent-pending sensor that waters the plant only when the plant actually needs the water by drip irrigation. Because root demand turns the PlantWatcher on and off, the plant basically waters itself. The space-age sensor is in contact with the soil, constantly measuring soil moisture. Moisture decreases as the roots suck water out of the soil. Available water in the soil migrates toward the roots and sucks water out of the sensor by capillary action. When water is removed from the sensor, air can flow through the sensor and allow water to slowly drip out of the PlantWatcher. In other words, the sensor is an air control valve.
Price: $20.98
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