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Ah, a question I have a lot of experience with. We had numerous white pines in our yard. Yes, the needles will kill your grass. A few needles won't do much harm, but lots of needles will so it pays to rake them up. Put the needles around acid loving plants (roses, azaleas, etc.) You can also put them on top of daffodils with no harm.
In turf too heavy will be harmful. Around plants in beds it is used as a mulch.
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