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What To Do With Pine Needles. Pine needles are a scourge to many gardeners. While leaves that have fallen from trees can be easily raked up, blown away, or crushed underfoot, pine needles lie in ever-growing mats on the ground and are more difficult to remove.
Pine needles are so slightly acidic that they do not cause soil to become acidic quickly. When needles have been present for decades from large numbers of pine trees, as in a mature pine forest, the soil is likely to become a little more acidic, but the change is small even under those conditions.ost gardeners find it difficult to grow garden plants under pine trees. Indeed, it is often impossible to maintain grass under pines. This problem has traditionally been blamed on acid soil, since gardeners believe that pine trees create acid soil.