It seems obvious to not shock roots with hot or cold water when watering, but are there benefits to using water with a certain temperature?
For example, can temperature stimulate root growth or have any benefit at all?
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Hot or cold water will not benefit the plant in any way. Water that is hot (even the water in a hose that was left out in the sun all day) can scald the foliage and also harm the roots. While cold water can really damage the plant's roots, especially tropical houseplants. The best temperature is between 62f and 72f (or room temp.). Timing does play a role however. Watering in the morning is the best time. The temperatures are cool and less water will be lost do to evaporation from heat. Not saying you could not do it during the day, try to make sure the water is not hot from leaving the hose out as said before. Or even cold if it comes from a cellar like mine. It tend to be very cold. And in summer I have 90f weather. Do not water to often, for which wet foliage is susceptible to fungus infections.