Low temperatures—especially when they come on quickly—can harm both roots and leaves. In some cases, if the temperatures fall well below a plant's natural tolerance, the plant dies back at the root and won't recover in the spring. Dry air and cold winds can combine to over dry leaves, shoots and even branches, resulting in scorching and death of leaves and twigs (or even whole plants). When soil is dry and exposed to winter winds, this kind of damage can be at its worst.
Even in the fall and early spring, frost damage can threaten your yard—especially if your lawn maintenance isn't up to date. Frost results when dropping temperatures condense moisture in the air onto leaves and twigs, which then freezes. If a plant is still actively growing or producing flowers or fruit, the damage can be particularly severe. Brown or blackened leaves, stems, or fruits—or twisting of new growth—can be symptoms of frost damage.
Some diseases thrive in winter conditions, too. Dormant plants have little recourse when it comes to fighting off disease. Gray snow mold (typhula blight) and pink snow mold (fusarium patch) are two of the worst culprits. In the coldest part of the winter these diseases go dormant, too, but spores develop and spread when wind blows or raindrops splash. In the spring, you'll first see small spots in your yard that develop into large discolored patches as much as 2 feet across. If you have cold, wet weather, snow mold is always a threat.
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