Mrs. Homegrown here:
So I just learned I’ve been taken in by a popular myth. You know how in the summer, the leaves of some plants go droopy in the heat of midday, then bounce back when it cools off? I’d heard…somewhere…who knows how these things get planted in your brain…that this was nothing to worry about. I’d also heard that was ineffectual, anyway, to water them midday.
Well, I was wrong. Erik just sent me a link to a post from one of his favorite blogs, WSU Extension’s The Garden Professors titled Hot Weather and Not-So-Hot Advice, which scientifically refutes this myth, and gives us permission to water midday, if necessary, to save the plants.
In a nutshell, droop is bad. Droop is stress. There should be no droop.