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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.
In addition to lack of water, many other factors can lead to browning of needles. Rapid fluctuations in temperature, especially in the fall before plants have time to harden off, can injure plant tissues. Salts that are used to treat icy roads can be damaging to evergreens, especially white pines.