In an age that stresses the importance of water conservation, there are many plants that require less water than other more traditionally grown plants. In order to optimize their water usage efficiency, experts recommend watering such plants during the cooler times of the day.
One may conclude from the above statements that water efficient plants should be watered

at 6:00 a.m., when the sun has just risen.

Explanation

The selection states that such plants should be watered during the cooler parts of the day. 6:00 a.m. is the coolest time of day listed.

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