Lithops, commonly known as "living stones," are succulent plants native to arid regions of southern Africa. They thrive in environments with extreme temperatures, but their natural habitat rarely experiences freezing conditions. These plants have adapted to survive long periods of drought by storing water in their thick, fleshy leaves. However, their tolerance to cold is limited, making winter care crucial for their survival in non-native climates.
Lithops can tolerate mild cold but are highly susceptible to frost and prolonged freezing temperatures. Most species can withstand brief dips to around 5°C (41°F), but temperatures below this range can cause irreversible damage. The cells in their leaves are prone to bursting if frozen, leading to rot or death. Therefore, winter care must focus on protecting them from extreme cold and excessive moisture.
To ensure Lithops survive winter, follow these essential care practices:
Keep Lithops in a controlled environment where temperatures remain above 5°C (41°F). If grown outdoors in temperate climates, move them indoors or into a greenhouse before the first frost. Indoors, avoid placing them near drafty windows or unheated spaces.
Lithops enter dormancy in winter and require minimal water. Overwatering during this period can lead to root rot. Water sparingly, only if the plant shows signs of severe dehydration (e.g., extreme wrinkling). In most cases, no watering is needed from late autumn to early spring.
Even in dormancy, Lithops need bright light to maintain health. Place them near a south-facing window or under grow lights for at least 4–6 hours of indirect sunlight daily. Insufficient light can cause etiolation (stretching), weakening the plant.
Use a well-draining soil mix, such as a blend of coarse sand, perlite, and gritty potting soil. Ensure the pot has drainage holes to prevent water accumulation. Soggy soil is especially dangerous in cold weather, as it increases the risk of root rot.
If Lithops are exposed to cold, they may show symptoms like soft, mushy leaves or discoloration (yellowing or browning). Immediately move the plant to a warmer location and avoid watering until it recovers. Trim damaged parts carefully to prevent rot from spreading. In severe cases, the plant may not survive, but early intervention can improve its chances.
Care requirements vary depending on local climate. In mild-winter regions (e.g., USDA zones 9–11), Lithops may survive outdoors with minimal protection. In colder zones, indoor care is mandatory. Always monitor weather forecasts and adjust care routines accordingly to prevent cold damage.
As winter ends, gradually reintroduce Lithops to regular care. Begin watering lightly when new growth appears, typically in early spring. Resume normal watering and fertilization only after the plant fully exits dormancy. This gradual transition helps prevent shock and ensures healthy growth for the upcoming season.
