Plant growth regulators (PGR) are often used in floricultue are any of the chemicals labeled for cannabis.
https://www.extension.purdue.edu/extmedia/ho/ho-248-b-w.pdf
I would only look at drench.
Many of these can be plant derived and labeled as a supplement.
From the voices in my head
Ethan
There are some naturally derived PGR’s that are used but many PGR’s are harmful to ingest, the big one being paclobutrazol. Putting these on ornamentals is very different than putting them on something you ingest, let alone smoke.
Yes anything in the wrong amount is bad. In apples there is an absistion compound that is an ethlyn that is used to cause all the apple smaller than 1/4 inch fall off. Keeps the trees from becoming fruit bound. What can we use to decrees internodal space?
Triacontonal is a popular natural PGR for cannabis but not necessarily for internodal spacing. I strongly reccommend against using any amount of artificial PGR’s. They have been shown to be very dangerous to health. A few links:
https://www.durangocannabisco.com/article/understanding-dangers-plant-growth-regulators-pgrs#
https://friendlyaussiebuds.com/cannabis-resources/pgr-toxic-weed/
Gotta run, but have a good night!
Agreed that is bad stuff. 
What I am looking for is internodal spacing in natural dwarf cannabis. No dna sample are in the public database. https://opencannabisproject.org
I am looking for a sequenced dwarf. I think it will be a know auxin and a known transcriptor.
Gives a target for either more dwarf (my preference) or taller plants.
The better floricultue compounds for keeping mum short is ancymidol. I don’t remember how they figured out how to prevent stems illonggating (sp?). But, it causes interpretation of an ethlyn cycle.
Great point, @gabriel! Growers can find triacontanol in alfalfa if you want to get it from a natural source. Just a fun FYI.
Triacantonol will stimulate trichome production and give a more resinous final product. I recommend amending soil well in advance of flowering and always staying away from unnatural sources of triacantonol. Snowstorm is a product that has triacantonol as an unlisted ingredient.
Ethan,
Most widespread usage of PGR’s in cannabis is probably the active ingredient in rooting compounds. Usually indole butyric acid sometimes also contains indole acetic acid… Gibberellic acid is used for fruit elongation ( almost all Thompson seedless grapes and many other grape varieties are sized with application of low rates of gibberellic acid). In the United States all PGR’s are regulated by the EPA. To get the label you must submit the label with intended crops, and very clear and concise quantification of the active ingredients is ppm content.
As you stated ethylene gas is a natural ripening agent given off by all fruit. ( It is interesting that bananas are shipped from central/south America by boat. The fruit is picked and shipped very green. When the boat is a couple days from arrival they flood the hold with ethylene gas. This gets the ripening going and the bananas start producing their own ethylene…that is why your green bananas ripen so quickly!!)
I think I gave almost the same answer 35 years ago. But, I had photos of the old banana lockers. And rail cars and trucks. I was in one banana locker in Denver that was scary big. The locker was ww2 surplus for what?
Thank you
From the voices in my head
Ethan
