Holly Bushes
Q.

What causes discoloration on edges of Holly leaves?

Zone Central Ontario, Canada | holly ollie added on June 28, 2015 | Answered

My holly plant has very dark green healthy looking shiny leaves, but just the edge of each leaf is black, like someone ran a small paint brush all around the edge. Would this be a disease or something not right in the soil?

    A.
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    Downtoearthdigs
    Certified GKH Gardening Expert
    Answered on June 29, 2015

    I have not been able to identify anything by the description you have given.
    Are there any other markings on the leaves? Yellowing, spots, fungus marking, insect holes?
    It certainly could be caused by heavy conditioned water, for example softened water, heavy flourides.
    You could treat the plant with Neem Oil, as it acts as both a fungicide and pesticide.

    https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm
    http://www.aces.edu/pubs/docs/A/ANR-1087/ANR-1087.pdf
    https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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