July 2022 - 32

PRODUCTION
O
I
BY USING PLANT GROWTH
REGULATORS IN YOUR
GREENHOUSE OPERATION
Incorporating a PGR in in your operation helps ensure strong, attractive crops from the time
they leave your greenhouse to when they reach customers.
BY NANCY RECHCIGL
P
lant growth regulators (PGRs) differ by their active ingredients,
application methods and rates, and more, which means achieving
the desired outcome can be complicated. Understanding how
to select and use a PGR effectively in your operation is critical for the
production of consistent, high-quality crops.
PGRs can be applied a variety of ways, including by foliar spray, drench
or pre-plant bulb soak. Foliar spray and drench applications are the most
common methods, and deciding which PGR and application method to use
depends upon the crop and outcome you need.
While a foliar spray is used to achieve moderate height control for
a shorter time period, drench applications are often used in the final
weeks leading up to shipping to minimize stretch and keep plants in
their desired shape for longer at retail. Drench applications can also be
beneficial during periods of cold, rainy weather or abnormally warm night
temperatures, as these conditions can cause plants to stretch.
HOW DOES A PGR REGULATE PLANT SIZE?
When applied as a spray, PGR active ingredients are absorbed by either
the leaves and/or stems (depending upon the PGR being used) and
32 JULY 2022 GPNMAG.COM
translocated within the plant where it reduces internode elongation.
Spray applications are best done early in the morning or late in the day
to allow the sprays to dry slowly for good absorption.
With a drench application, the active ingredient is absorbed by plant
roots and transported to all areas of the plant. The desired effects of a
drench application typically last longer because the PGR is retained by
the growing media and available to the plant over a longer period.
ACTIVE INGREDIENTS
PGRs used to limit shoot growth and maintain compact plants grown
in containers contain active ingredients such as ancymidol, daminozide,
flurprimidol, uniconazole and paclobutrazol. PGRs containing these
active ingredients target and inhibit gibberellin production, which is
responsible for stem elongation.
Some PGRs contain active ingredients that are plant hormones,
including gibberellins and benzyladenine. These can affect growth and
development, such as plant flowering or branching. Without a proper
understanding of the active ingredient in your PGR, you may not achieve
the desired outcome. Additionally, active ingredients come with a host
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http://www.GPNMAG.COM

July 2022

Table of Contents for the Digital Edition of July 2022

July 2022 - 1
July 2022 - 2
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https://www.nxtbook.com/greatamericanmediaservices/GPN/new-varieties-digital-guide-2024
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-cannabis-production
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-december-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
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https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2022
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2019
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