Some of the chemicals we used to grow more compact plants, mostly annuals, did loose their effect after awhile. The treated plants usually reached their potential size. Two brand names come to mind: Be-nine and A-rest, not sure of spelling. The purpose was to produce a more compact plant and encourage early blooms. The result was an attractive six pack, market pack, or potted plant, with good marketability.
It also prevented a leggy crop if the weather was not cooperating.
I'm not sure if this is still widely used or not, there have been many improvements in growing technology and genetic modification since I worked in the field.
