No, Dry KoolBloom® works on the premise that the plant is shocked into mass flowering. Shocking the plant too much can cause rotting, bloom loss and in extreme cases plant death.
KoolBloom® can safely be used three to four weeks before the end of the plants life cycle. Use only the recommended dose of 1/4 tsp per gallon (1.5 g / gallon). This will increase the ppm by approximately 200 ppm (0.4 mS).
For further information, refer to the feedcharts for your GH program.
Use a less aggressive nutrient strength in the range of 1000-1200 ppm (2-2.4 mS) before adding the KoolBloom.