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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.
Since your source for pine needles is probably not green, they are NOT acidic. Collecting old pine needles is pointless if you are trying to acidify your soil. The second point is that even when fresh, pine needles are only slightly acidic and therefore can have limited effect on changing the pH of the soil. But, but, but, you say â surely over many years, the acidity must build up. This seems very reasonable and so some scientists tested this theory.