Recall that I swore my mustard plants were moving.
Heliotropic? That is, moving to face the flowers into the sun?
Maybe.
So I did a little time-lapse video. This is one day of the mustard bed in my garden. Roughly 8 AM to 8 PM, with a brief interruption in the middle to add a tin-foil shield. All condensed into about 30 seconds via YouTube.
The dance of the mustard flowers appears far more complex than simple heliotropism. And far weirder.
Enjoy.