Without listing things I have run across, it would be fair to say that plants respond to sound, light, soil, water, energy.
Lets discuss what we know and are sure of, and in time - claims we have each heard, some proved true and some proved not true.
We know that birds see ultraviolet, and that is one of the main light frequencies from 4AM till dawn is visible to us. Birds start singing from 4 AM onward in most places. (one of the things a night shifter picks up on his off nights around all areas of the USA.)
That is the same time dew is condensing or has already condensed on plant leaves (for the most part).
We know that these 4 constants have remained steady since soon after Eden,
(1.)false dawn being the ultraviolet spectrum of dawn -
(2.)UV "false dawn" which is visible to birds. They wake up and sing from then till dawn is visible to us and progresses till visible light over powers the amount of ultraviolet in the sky.
(3.) Before or during false dawn the night has cooled enough for dew point to be reached and dew to condense on plant leaves - assumably when their stoma's are open to drink it in through the leaves.
(4.) Something that srengthened plant growth and productivity - was switched off to a large degree as a general but not exclusive rule. (remember one bunch of grapes on a pole carried by 2 hebrew spies.)
Genesis 4:
11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother’s blood from thy hand;
12 When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth.
13 ¶ And Cain said unto the LORD, My punishment is greater than I can bear.
What if that something could be understood to a small degree, and turned up somewhat, greatly strengthening plant growth and productivity ?
Numbers 13:
22 And they ascended by the south, and came unto Hebron; where Ahiman, Sheshai, and Talmai, the children of Anak, were. (Now Hebron was built seven years before Zoan in Egypt.)
23 And they came unto the brook of Eshcol, and cut down from thence a branch with one cluster of grapes, and they bare it between two upon a staff; and they brought of the pomegranates, and of the figs.
24 The place was called the brook Eshcol, because of the cluster of grapes which the children of Israel cut down from thence.
25 And they returned from searching of the land after forty days.