Key Points for Protecting Orchids from Cold When a Cold Snap Arrives

A cold snap usually refers to a weather process in which strong cold air from the north moves southward on a large scale and temperatures drop noticeably within a short time. For flower growers, especially orchid enthusiasts, whether protective work is done properly before a cold snap arrives directly affects whether the orchid plants can overwinter safely, so after winter begins, one should develop the habit of paying attention to weather forecasts.

The cold tolerance of orchids varies by variety. Species such as Cymbidium goeringii and Cymbidium faberi, whose native habitats have lower winter temperatures, are relatively cold-tolerant, and a short period of light frost is generally not fatal; while Chun Jian, Song Chun, and some orchid species introduced from the south have weaker cold resistance and are more likely to be injured when a cold snap hits, so preparations should be made in advance to protect them indoors.

Before the cold snap arrives, potted orchids should be moved indoors or into a greenhouse in time to avoid direct cold wind and frost forming on the leaves. Indoor temperatures should not rise abruptly; too great a temperature difference from the outside can instead easily stress the orchid plants. At the same time, watering should be reduced and the potting soil kept on the dry side, because low temperatures combined with high humidity are most likely to cause root rot and disease.

If orchid leaves have already been frozen, water-soaked patches often appear first, followed by blackening and drying. Frozen plants should be moved to a lower-temperature but relatively stable environment to recover slowly, and one must absolutely not immediately expose them to sunlight or water them heavily. As long as the pseudobulbs and root system remain intact, most can still send up new growth again the following spring, so there is no need to discard them in a hurry.