Atrimmec acts by killing the apical meristem. What I find is that there is some phytotoxicity, however the end effect is that the plant stays shorter and fills out. I have used it on stemmy hibiscus for that reason.
In my area, I do not know why growth regulators are unpopular. There is no such thing as leaving cuttings on property or at the curb. Landscapers must pay an arm and a leg for disposal unless they also have a 2 or 3 acre yard where they can dump stuff and let it rot. A rig like my engine drive backpack with disc-core nozzles would be the idea means to apply. 7 gallons applied in 7 minutes.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738