When I studied farming back in 1998-1999 we once visited a greenhouse and one interesting thing I picked up was that by observation some gardeners had realized that lowering the temperature a bit extra an hour or two before sunrise they could get their flowers to be more compact instead of stretching.

This had replaced shortening hormones in modern gardening (or at least at that greenhouse, but my understanding they were just doing the same thing as everyone else).

I guess there is a lot more to learn for those who have scale enough to experiment and patience to follow through.