He says they absorb water slowly? That could explain why I see it, then. It's not that they don't have enough water (mine will do it when I have the pot sitting in a tub with water), but that when it gets too warm, they transpire moisture they've taken up faster than they can replace it. So the new softer growth loses turgidity and flops, then stands back up when it cools off and they can take up water as fast as they transpire it. That would fit exactly with what I've observed in my plants. As the growth slows and the leaves themselves get more fiber as they age, they don't fall because they are more rigid with mature growth than the new leaves in the center. In a hot area with low humidity, I don't see any way to avoid that and it doesn't seem to harm the plants in any significant way. All my speculation, of course - where's the 'take it with a grain of salt' icon?
