PGRs (plant growth regulators): anyone with ref.s / info / exp. about using PGRs to dwarf trees in the landscape?

paclobutrazol seems the most likely. Context:❤ Amer. Sycamore, but it gets huge & trunk hollow, not a good choice next to one's home.

https://tcimag.tcia.org/tree-care/what-can-tree-growth-regulators-do-for-you/