Illinois State Florists' Association
IN THE PAST FEW YEARS, there has been considerable interest in the use of chemicals to retard plant growth. USDA researchers pioneered in this work and found a number of effective dwarfing agents. Among them were CCC (2-chloroethyltrimethylammonium chloride) and PHOSFON-D (2,4-diehlorobenzyltributylphosphonium chloride). The main advantage in using such materials on certain chrysanthemum varieties, early propagated poinsettias, lilies, and other pot plants is that they may prevent excessive stem elongation. The USDA demonstrated excellent control of height in poinsettias with CCC. Phosfon is now used commercially in pot mum production, and has also been reported to be effective in dwarfing poinsettias. However, further tests were needed to establish which of these materials— CCC or Phosfon—is more desirable for eliminating excessive stretch in poinsettias, and to determine optimum application rates.
Keywords: CCC (2-chloroethyltrimethylammoniu Phosfon PHOSFON-D Stem elongation Dwarfing agents