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Floriculture & Greenhouse Crop Production

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  • Green and blue LED lighting

    Published on March 6, 2019
    Indoor production of leafy greens, Part 2 of 4: How green light affects lettuce growth can depend on blue and red light.

  • The economics of lighting young plants indoors

    Published on June 12, 2019
    This article provides the framework of the economics of indoor lighting of young plants (transplants). It includes example costs for an indoor plant factory in Japan, and provides highlights for indoor lighting used by two commercial growers in the U.S.

  • LEDs: Far red & light intensity interaction

    Published on March 4, 2019
    Part 2 of a 5-part series explains how far-red light and light intensity (the photosynthetic photon flux density) interact to influence growth of young plants indoors, under fully controlled environments.

  • What is the ideal lighting spectrum?

    Published on March 16, 2020
    With LEDs, we can tailor the light spectrum to elicit specific growth responses. This article discusses some of the considerations to identify an “ideal” plant lighting spectrum. As you will read, it’s highly situational.

  • Lighting young plants indoors

    Published on February 4, 2019
    Part 1 of a 5-part series is an introduction to producing young plants indoors under fully controlled environments.

  • Growing ornamental seedlings under white LEDs

    Published on November 15, 2018
    Michigan State University researchers discuss the impacts of using white light on plant growth and human vision, as well as energy considerations when growing ornamental seedlings indoors.

  • How much supplemental lighting do you need?

    Published on December 17, 2019
    Several factors need to be considered when choosing a supplemental lighting system, and arguably the most important one is to determine what light intensity you want to deliver. This article provides steps on how to do that.

  • UV radiation and applications in horticulture

    Published on May 1, 2018
    Ultraviolet (UV) radiation is outside of the photosynthetically active waveband, but it is biologically active and regulates plant growth.

  • Evaluating greenhouse supplemental lighting

    Published on November 17, 2016
    Researchers at Purdue and Michigan State University compare young and finished plant production under LED toplighting and HPS lamps to determine which source is most effective.

  • The importance of light uniformity

    Published on March 3, 2017
    Managing light is obviously critical to the production of crops grown in controlled environments. When considering the different dimensions of light, we often overlook the importance of light uniformity.

  • Red light spectrum - Role of far red radiation

    Published on November 9, 2016
    What are the potential benefits for including far-red radiation when growing seedlings indoors?

  • Sole-source lighting of plants

    Published on September 13, 2017
    Sole-source lighting is a term used to describe the deliver of light to plants that do not also receive light from the sun. In other words, electric lighting is delivered indoors and provides the sole source of light for plant growth and development.

  • Far red is the new red

    Published on February 6, 2017
    Adding far red to red and blue light from LEDs brings control of plant growth to the next level.

  • An overview of long-day lighting

    Published on July 17, 2019
    There are a lot of factors to consider for effective and efficient long-day lighting. This article provides a brief overview of when and how to deliver lighting to create long days inside greenhouses.

  • Developing new plant lighting standards

    Published on October 23, 2017
    Standards are developed so there is consistency and conformity in products to improve confidence and comparability in new technologies.

  • Supplemental lighting on bedding plants -- Making it work for you

    Published on December 29, 2006
    This article discusses the benefits of both photoperiodic lighting (day length control) and photosynthetic lighting (increasing light quantity to increase plant growth) on bedding plant crops.

  • DLI 'requirements'

    Published on May 10, 2019
    This article provides daily light integral (DLI) guidelines to produce plants of at least moderate quality, assuming plants are grown at moderate temperatures.

  • Supplemental and sole source LED lighting

    Published on August 9, 2017
    Joining me today is Erik Runkle, professor at Michigan State University. Erik is well known in this magazine for his “Technically Speaking” column appearing inside the back cover.

  • Effects of blue light on plants

    Published on February 2, 2017
    Blue light is usually referred to as radiation with wavelengths between 400 and 500 nanometers. This waveband is within the visible spectrum, has relatively high energy, and has pronounced effects on plant growth and flowering.

  • Investment considerations for greenhouse lighting

    Published on October 11, 2017
    Many growers install and operate supplemental (photosynthetic) lighting to increase crop quality and yield. This article describes some of the factors to consider when investing in a supplemental lighting system for greenhouse crop production.