Growing cannabis plants requires the use of many different chemicals that are needed to insure that every harvest is filled with the best quality and largest size buds. Chemicals used in marijuana cultivation range from pH up & down, cleaning solutions, insect and spider mite sprays and oils, along with some more. Chemicals are not to be confused with Nutrients to grow marijuana plants. Nutrients or Nutes are used as food and vitamin/nutrient supply. Chemicals are used as cleaning agents, pH adjusters & so on.