Leafy Greens in Controlled Environments

  • Michigan On-Farm Produce Safety Newsletter

    Published on July 31, 2024
    News articles, fact sheets, videos and podcasts produced by Produce Safety Technicians and MSU Extension Educators to support growers and stakeholders succeed in their on-farm produce safety efforts.

  • The transient effects of indoor lighting on lettuce production

    Published on May 2, 2024
    We compared the effects of end-of-production ultraviolet-A and blue light to earlier or continuous application of either waveband on red-leaf lettuce yield and quality grown indoors.

  • Improving lettuce nutrition & coloration with lighting

    Published on February 9, 2024
    We evaluated the effects of supplemental UVA light, blue light, or both at the end of production to increase red-leaf lettuce coloration and nutrient concentrations.

  • The importance of transpiration

    Published on September 1, 2023
    Transpiration is the process of water movement from the roots to the shoots of plants. As boring as it may sound, understanding the process can provide valuable insights into successful crop production.

  • A closer look at the effect of white LEDs on plant performance

    Published on January 5, 2023
    This article summarizes an experiment with lettuce and kale when grown indoors under different white light-emitting diodes (LEDs).

  • Answering key questions about indoor crops

    Published on November 9, 2022
    In part three of a four-part series, we discuss crops suitable for indoor farming, planting densities, harvest times, and other commonly asked questions about growing crops indoors.

  • More questions answered

    Published on August 3, 2022
    In part two of this four-part series, we respond to questions about lighting, carbon dioxide enrichment, co-optimization, and sterility within indoor farms.

  • Indoor farming FAQs

    Published on May 4, 2022
    In the first of a four-part series, plant scientists and engineers from Project OptimIA address frequently asked questions (FAQs) about growing plants inside indoor vertical farms.

  • Photoperiod, light intensity, and daily light integral

    Published on March 1, 2022
    We report and discuss research results when growing lettuce indoors under different light intensities and photoperiods under a range of daily light integrals.

  • Fixed vs. dynamic light quality for indoor hydroponic lettuce

    Published on February 2, 2022
    We present research results with lettuce plants grown indoors under a fixed lighting spectrum versus changing the spectrum during production.

  • Water vapor-pressure deficit

    Published on December 6, 2021
    The driving force for plant water loss is best described by the vapor-pressure deficit (VPD). This article discusses VPD classifications and what values are suitable during crop production.

  • The buzz of secondary metabolites

    Published on November 9, 2021
    Secondary metabolites can be an important plant quality characteristic, especially in specialty crops that are ingested. They can be modified through breeding activities as well as by plant culture and the environment.

  • Far-red and PPFD: A tale of two lettuce cultivars

    Published on October 5, 2021
    In part 3 of a 5-part series on the indoor production of leafy greens, the interactive effects of far-red light and light intensity on lettuce growth are discussed.

  • Light spectrum for different applications

    Published on September 8, 2021
    This article discusses the effects of the light spectrum on plants, and conceptually how it can be used for different greenhouse and indoor crop production applications.

  • Differentiating broad spectra

    Published on September 6, 2021
    In part 2 of a 5-part series on the production of leafy greens indoors, this article discusses how substituting white light (broad spectra) with red and/or blue light influences lettuce production.

  • Challenges of growing vertically in greenhouses

    Published on June 8, 2021
    There is a wide range of vertical farming approaches for greenhouse cultivation, but there are also challenges, some of which cannot easily be overcome.

  • LEDs on lettuce: White light vs. red+blue light

    Published on June 7, 2021
    In the first article of a five-part series on indoor production of leafy greens, we join the lighting debate discussing white versus red and blue light from a crop production perspective.

  • Culinary Herbs: To flower or not to flower?

    Published on February 1, 2021
    Researchers set out to observe whether changes in photoperiod or day length influence flower initiation in herbs like basil, oregano, mint and more.

  • Purpling of leaves

    Published on January 8, 2021
    There are many specialty crops that naturally have red, purple or almost black foliage, while others turn those colors when conditions are unfavorable. This article briefly reviews the factors that influence the purpling of leaves.

  • Indoor Production of Herb Seedlings: Light Intensity and Carbon Dioxide

    Published on December 1, 2020
    We highlight the results of pushing the lighting and carbon dioxide envelope during the production of dill, parsley, and sage seedlings indoors without sunlight.

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