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Will be quite acidic if used in large amounts but that quantity would compost ok... :)
There's a pine which leaves TONS of needles and cones all over my mum's garden, and it rots down to a beautiful looking dark, fluffy compost, like the sort of compost you'd dream of, if you had such odd dreams. But because we heard it was acidic, we don't use it for anything. Maybe she should test it to see if it loses it acidity by the time it breaks down to compost, it looks like a great soil conditioner.
Pine needles are an excellent weed-suppressant mulch, but be aware that they exude a substance that hinders seed germination