Multiple applications, at lowest rates, may be necessary. DO NOT apply Sumagic to poinsettias after the beginning of short days. With sensitive cultivars like 'Supjibi' and 'Freedom' start at lowest rate. Applying PGRs PGRs must be applied uniformly in order to cause uniform inhibition to plant growth. Spraying is easiest but the least uniform way of applying PGRs to poinsettias.
Actual volume depends on pot size.
Of course, more labor is required to make drench applications compared to sprays. Normally PGRs are applied during cloudy weather. The effectiveness of Cycocel and B-Nine is increased when conditions favor slow evaporation. Growth medium should be uniformly moist when drench applications are made. Additional specific precautions are discussed in the accompanying table.