A plant growth retardant and triazole fungicide. It is a known antagonist of the plant hormone gibberellin. It acts by inhibiting gibberellin. Chemical formula: C15H20ClN3O Abbreviations: PBZ Solubility in water: 26 mg/L (20 °C) Molar mass: 21 . PZB is used mostly in floriculture. It is illegal in the USA to use it on food crops. Plants absorb it mostly through the stems and roots. It can be applied as a dip, drench or spray. Dip and drench rates vary from 5 to 10ppm (parts per million) while spray rates from 60 to 90ppm. Spray is often applied every few weeks to maintain growth results. Dip and drench is most often used for young plants while spray for older. If a plant has reached a desirable size, a high rate drench may be used to stop further growth. This is often done for plants that will remain in a given container. Late sprays in particular may result in delayed and smaller flower size. Some experimentation may be needed to determine the best practices for your particular application. . Dissolves in acetone, cyclohexanone, dichloromethane or methanol . As with all plant hormones keeping it cold will help to preserve it. I keep mine in the freezer. There is concern that it damages the liver and is possibly a carcinogen. Evidence shows that it is not dangerous to intact skin. It causes eye irritation and inhalation is unpleasant. To be really safe, avoid contact with broken skin by using gloves and other measures and do not ingest or breathe powder or solutions. 1. Wikipedia
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