Are you looking for heavier flowers? You’ve grown your crop through the vegetative stage and now you are ready to turn the lights down and let it begin its flowering stage. It is now, after the framework of the plant has been set during the vegetative period, that there is a massive surge in the plant’s requirement for more potassium to develop flowers. It is at this point that potassium in the solution can drop to critical levels. Plants are very adaptable, however and in the case of lowered potassium availability, will simply slow down their growth rate to match the available potassium.