Height Management of Ornamentals

Height control of perennials: What works and what doesn’t

Published on August 17, 2020
This article discusses height control techniques that generally do or don’t work for herbaceous perennials forced into flower.
Success with PGRs

Published on March 18, 2019
Regardless of the desired outcome, successful use of a plant growth regulator (PGR) requires multiple considerations and attention to detail. This article summarizes practices to obtain the best results from your PGR applications.
Ethylene in floriculture

Published on January 7, 2019
Ethylene can be a harmful contaminant in greenhouses and during shipping, but there are also situations when ethylene can elicit desirable responses in greenhouse crop production.
Using a GA to increase plant height

Published on August 8, 2018
Regardless of the cause, the most common technique to increase plant height of containerized flowering plants is an application of gibberellic acid by someone certified as a pesticide applicator.
Increasing height of chrysanthemum with PGR drenches

Published on July 10, 2017
Results are presented for an experiment in which we compared the efficacy of spray versus drench applications of a plant growth regulator (PGR) at increasing plant height of potted chrysanthemum plants.
Understanding how PGRs work

Published on May 17, 2017
Plant growth regulators are chemical compounds that regulate various growth and developmental processes in plants, such as seed germination, rooting, branching, flowering, fruit development, dormancy and plant growth habit.
Fascination on poinsettia

Published on August 8, 2016
Did you hit your poinsettias with too much growth retardant? This Michigan State University research shows how to recover using products that contain gibberellic acid.
Environment and PGR interactions

Published on December 17, 2015
When plant growth regulators (PGRs) are applied as sprays, their efficacy can be greatly influenced by the environment. Understanding how environmental factors influence PGR spray efficacy can lead to more effective and predictable plant responses.
Potential Effect of Water Quality on PGRs

Published on November 18, 2015
Trending: PGR sprenches

Published on April 17, 2015
A sprench of a plant growth regulator (PGR) is a hybrid of a spray and a drench application, and is increasingly being used in the production of greenhouse ornamentals.
The PGR ancymidol

Published on February 17, 2015
Plant growth retardants (PGRs) that contain the active ingredient ancymidol aren’t as commonly used in floriculture as most other PGRs, but there are some potential upsides that merit consideration.
Increasing plant height

Published on October 17, 2014
There are numerous ways to promote extension growth, including changes to plant culture or the growing environment, or applying a plant growth regulator that includes gibberellic acid.