For any date, time, and location, it's possible to calculate the amount of light grass would get in full sun. I describe how this is done, and show a calculator that will find this value for you.

Direct link to the blog post: https://www.asianturfgrass.com/post/shade-and-sun/
Direct link to the PPFD calculator: https://asianturfgrass.shinyapps.io/ppfd_by_time/

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Find turfgrass information and decision-making tools at https://www.paceturf.org/
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