Winter has officially arrived, and with it the familiar sense that the gardening year has gone dormant. Nights have dipped well below freezing, snow has already appeared, and most beds look settled in for the long pause before spring. But beneath the surface, winter is quietly doing some of its most important work.
This is, in fact, an ideal time to harvest root crops such as carrots, beets and parsnips. In cold weather, these plants protect themselves by concentrating sugars in their roots, which lowers the freezing point of the water inside them and improves flavor. Most carrots and beets should be harvested before the ground freezes solid, though Kyoto Red carrots—a Japanese variety traditionally eaten to celebrate the New Year—are bred specifically for winter harvest. Parsnips reach peak sweetness in early spring, just as they begin sending up new top growth.
Belowground, winter is far more active than it appears. Scientists have found that in some alpine and Arctic regions, soil microbes are most abundant in late winter. These cold-adapted organisms thrive at low temperatures, then die off as conditions warm, releasing nitrogen into the soil from the plant litter they consumed through fall and winter. While studies from extreme climates do not translate directly to the Catskills, they underscore a broader truth: soil microbes remain active in winter as long as food sources—especially fallen leaves from deciduous trees—are left in place.
In cold regions like the Catskills, winter also plays a major role in forming topsoil. Repeated freeze-thaw cycles break down sand, rock and organic matter more quickly than warm weather alone. When water freezes, it expands, creating pressure that is released as it thaws, then rebuilt with the next freeze. Over time, this process fractures soil particles into ever-smaller pieces, increasing surface area and making nutrients more accessible to plant roots.
This slow rebuilding of soil is especially important given how much has been lost. A U.S. Department of Agriculture survey found that Midwestern farmland lost an average of 1.9 millimeters of topsoil per year over 160 years of plowing. In the Northeast, where European settlers arrived earlier and began intensive agriculture sooner, topsoil loss has likely been ongoing even longer. Winter’s steady contribution to soil formation helps offset that damage, if only in part.
Cold temperatures also keep some insect pests in check. The invasive spotted lanternfly, for example, is vulnerable to winter cold, though its eggs can survive; egg masses found on tree trunks can be scraped off and destroyed in rubbing alcohol. Temperatures below 15 degrees Fahrenheit can be lethal to the invasive gray garden slug, particularly during winters with repeated cold snaps, reducing slug pressure the following growing season.
Native insects, meanwhile, have evolved remarkable survival strategies. Monarch butterflies migrate to Mexico. Ladybugs enter diapause, a dormant state similar to hibernation. Question mark butterflies and many insect larvae produce glycerol, a natural antifreeze that allows them to survive freezing temperatures.
Perhaps winter’s most unexpected benefit comes from snow itself. As snowflakes fall, they absorb nitrogen compounds from the air. When the snow melts, that nitrogen seeps into the soil. While the amount is modest and not immediately available to plants, nitrogen-fixing microbes remain active through winter, converting it into usable forms. In a 2013 measurement, Ron Gelderman, a soils specialist with South Dakota State University Extension, found that a nine-inch snowfall contained roughly three-tenths of a pound of available nitrogen per acre.
Winter may look quiet, even lifeless, but it is laying essential groundwork for the growing season ahead. As gardeners settle in for the cold months, there is some comfort in knowing that beneath the snow and frozen ground, the soil is being renewed—and spring’s abundance is already taking shape.
Margaret Tomlinson is a contributing writer. You can send her an email at reporting@theoverlooknews.com.
