Paclobutrazol (PBZ)

Definition - What does Paclobutrazol (PBZ) mean?

Paclobutrazol (PBZ) is a plant growth regulator (PGR) and also a fungicide. Paclobutrazol is a synthetic chemical product that inhibits the top growth on a plant while encouraging root growth.

In addition to being known as a plant growth regulator, PBZ is said to be a plant growth retardant, a more specific reference to how it affects plant growth.

MaximumYield explains Paclobutrazol (PBZ)

As a known antagonist of the plant hormone gibberellin, PBZ is quickly absorbed by the roots and stems, but not as much through the leaves. Because of of this, it is most often applied as a spray, sprench, or drench, or as a dip on bulbs and other young plant.

Paclobutrazol produces stout stems and a dense foliage and is often used to increase seedset in commercially grown tomatoes and peppers. However, there is much debate over its use on edible crops.

Some research indicates that Paclobutrazol may reduce frost sensitivity in plants, but this is not its primary current use.

Paclobutrazol is primarily used to restrict the top growth, but it also helps increase the nutrients a plant receives through stronger and more active roots. This encourages the plant to complete its life cycle more rapidly and produce fruit at an earlier age.

PBZ also helps a plant become more drought resistant, produce rich greener leaves, a higher resistance to fungus and some bacterial infections.

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