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Floriculture & Greenhouse Crop Production

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  • What's All the Hype on Poinsettia Micro-Drenches?

    Published on August 21, 2021
    How do PGR micro-drenches compare to one heavy PGR drench on two red poinsettia cultivars?

  • 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 (GA) by someone certified as a pesticide applicator.

  • How does Spray Water Alkalinity affect the Efficacy of Commonly used Plant Growth Regulators?

    Published on November 7, 2017
    Did you know that pH of the spray solution and air temperature at application can influence the efficacy of some PGRs? We will show you how to save time and money, by monitoring and adjusting two often overlooked factors that can influence PGR efficacy.

  • 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.

  • 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
    Final spray water pH after plant growth regulation addition varies with pH and alkalinity of your carrier water.

  • 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.

  • Effective use of PGRs

    Published on July 18, 2014
    Plant growth regulators (PGRs) are sometimes not used to their potential; they are sometimes applied too late or at an inappropriate rate. Here are some important considerations for getting the most out of your PGRs.

  • Using chlormequat chloride with success

    Published on April 18, 2014
    Chlormequat chloride is a plant growth retardant used to promote flowering or inhibit extension growth of floriculture crops grown in greenhouses, shadehouses and container nurseries.

  • Successful use of the PGR daminozide

    Published on August 18, 2013
    The plant growth regulator (PGR) daminozide is used as a foliar spray primarily to inhibit extension growth of ornamental crops.

  • Using the PGRs Collate and Florel

    Published on June 18, 2013
    Achieving consistent results with the plant growth regulators (PGRs) Collate or Florel can be trickier than with other PGRs simply because the active ingredient, ethylene, is a gas.

  • PGR application considerations

    Published on May 18, 2013
    This article briefly presents some of the considerations when selecting which plant growth regulator (PGR) rate, method and active ingredient to apply to greenhouse-grown ornamental crops.

  • Non-chemical height control techniques

    Published on May 18, 2013
    There are several environmental and cultural practices that can produce shorter plants, but strategies must be implemented over a period of time to achieve desired outcomes.

  • Ethephon drenches on bedding plants

    Published on April 18, 2013
    In the second of a two-part series with ethephon (e.g., Florel), we shows that drenches are a viable method to control height and size of several bedding plant crops.