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The plant is yellowing, and pull out the root to find the white powdering thing... Anyone know what is this? how to prevent?

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  • Good question and good illustrations; could also be helpful if could include illustration of top of yellowing Tomato plant, watering amount & frequency, and if coarse gravel in bottom of container for good drainage & good aereation. Thank you. Welcome to the site!
    – M H
    Commented Aug 10, 2020 at 5:41

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