Poinsettia Height Control (1966)
The application of recent scientific findings has made "tailored" poinsettia plants the rule, rather than the exception in Minnesota. Six years ago, Lindstrom and Tolbert (k) reported that applications of CCC (Cycocel or 2-chloroethyl trimethylammonium chloride) to the soil of poinsettia plants resulted in the development of short plants with thick stems. Three years ago, Larson and Mclntyre (3) reported that B-995 (B-Nine or N-dimethylaminosuccinamic acid) effectively regulated the growth of poinsettias under certain conditions. ^) In 196^, Widmer (5) noted that soil drenches and foliar applications of CCC produced similar plant responses. In 1965 Widmer et al. (6) found once again that soil and foliar applications of CCC to poinsettia plants produced similar results. They also reported that B-995 applied to the foliage significantly reduced plant height, but that many florets of plants treated with high concentrations (7,500 ppm) failed to develop to normal size and frequently abscised prematurely, Widmer et al. (6) suggested the following application rates for the varieties Barbara Ecke Supreme and Paul Mikkelsen.
Source: • Minnesota State Florists' Bulletin