This is permanent damage, but it doesn’t mean the plant will die. On a cellular level, this means that as the water turns to ice, it expands, rupturing the cell wall. When temperatures drop to below freezing, the water inside the leaves freeze. But even these plants will be at risk when the temperature drops to below zero for unexpected extended periods of time. They drop their leaves, and the bare branches look almost dead until spring when new buds form and the plants look perfect. Most of these plants will go dormant in the winter. In northern zones 4 and 5, plants need to survive months of below freezing weather every winter. They will never survive outdoors in winter unless you live where the temperature stays at least above 50 degrees. Most houseplants are tropical plants that can safely grow in a heated home during the winter. ![]() ![]() That is why every plant is identified with a hardiness rating that matches where it can safely be grown. When plants are exposed to temperatures below what their native grow zone is, they will be vulnerable to cold shock. The window could allow cold outdoor air to infiltrate into the home - and if the glass isn’t insulated, damage to your plant can occur to any foliage that is in contact with the glass. Perhaps you have a plant that needs full sun and you have placed it on a windowsill to give it the best sunny spot. Perhaps a houseplant is located too close to the main entrance of your home where the cold outdoor air hits it every time someone enters or leaves.Ī tropical plant can suffer cold shock when temperatures drop below 50 degrees. But cold shock can occur indoors as well. When we talk about cold shock, it is usually after an unexpected cold spell that affected our outdoor plants like tender miniature roses, perennials and flowering shrubs. Salvia (Ornamental Sage) Plants for Sale. ![]()
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