edcrater wrote:substance wrote: lets just test this!
For how long did the leave you were observing move? If was just a single rapid move ...
On each occasion, several minutes. The movement is very regular. I can't say I have ever seen one start, because it is the motion that attracts the eye. Was that one just starting, or did I just start SEEING it? Dunno.
The amplitude is quite large - so large that one observes in disbelief. It seems to be generally soft green plants, rather than stiff ones.
I've thought of another point that might help in the diagnosis. Mostly the leaf-waving is "up-and-down". But once I saw a large strong leaf, a banana leaf or similar, some 2 ft long, rotating about its longitudinal axis instead. Maybe the leaf was too stiff for up-and-down motion, so the 'energy' translated into 'rotation'. It was moving through about 60 degrees on a cycle time of about 1-2 seconds. As usual, no other leaves were moving, the air being still.
Also, I have never seen any leaf move "side-to-side".
Also, thinking back [and I've never made any contemporaneous records of any of these events], I don't recall ever seeing a potted plant do it - only those planted 'naturally' in beds. Perhaps a potted plant has a different electrical environment.
The classic situation for it is in a botanical garden greenhouse, where the air is still. It is generally humid too, but I have no idea if that is relevant.
If you want to "test this", I suggest the following:
Go to a botanical garden greenhouse. It needs to be quiet. Kids running around shouting, or herds of tourists, are a no-no. Maybe that disturbs the electrical environment, or sound waves are involved, or turbulence, I know not. Find a still, quiet location, and stand still for a while. When all is quiet, relaxed and still, and has been so for a while, your eye might be attracted to movement. It might be a bird ferreting in the undergrowth, but it might be a leaf waving.
If it is, go closer, slowly and quietly, so as not to startle it. With luck, it will keep waving, ever more strongly until it is quite gross. If you are lucky and the plant is at the front of the bed, you will be able to approach within inches. Get down and examine it underneath, checking for silk-pulling spiders, or other unknown cause. Once you are satisfied, you might touch it, and see if it stops. That would be useful to know. You might also capture it on your video camera, and become famous for posting on youtube.
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