Uneven growth observed in these containers of impatiens may have been cause by uneven application and overdose when the plugs were sprayed with 4 ppm Bonzi prior to transplant. The affected plants had white healthy roots that failed to emerge from the plug cube.
For more information on using plant growth regulators see:
Message posted March 19, 2007
Fact Sheets: Growth Regulators for Bedding Plants
Subirrigating Seed Geraniums with Bonzi
2007-2008 New England Floriculture Guide: About Growth Regulators (PDF)