Quote:
Originally Posted by ceestyle
The biggest reason is that you lose a lot of water to evaporation.
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That and with some plants, if you leave water dropletts on the leaves during bright/hot days, you can scortch them because the water acts like a magnifying glass. I haven't personally had it happen - could be a urban legend, but when I have to water when it's sunny and we're still heading into the hot part of the day, I just try not to get any on the leaves.