What effect to the needles from pine trees, on the
grounds around it?
In the undisturbed forest, contributes to the forest floor/organic layer of
Used as a mulch in landscaping but contributes to acidification of the soil.
Also please see the following:
Anthony R. Brach
Pine needles are acidic, which inhibits growth of some plants; see a basic
ecology/forest ecology book for details.
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Update: June 2012