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Country Living’s gardening report advises moving most tropical houseplants indoors when nighttime temperatures approach the 40s, or earlier if frost is forecast. Before bringing them inside, inspect and rinse plants, address pests, quarantine them for at least three to four weeks, and adapt watering to lower light and slower winter growth.
Houseplants kept outdoors for summer should generally be brought inside when nighttime temperatures begin falling into the 40s, according to a Country Living gardening report. The timing matters because many common houseplants are tropical and cannot tolerate cold; plants should come in sooner if a frost or freeze is forecast.
Before moving pots indoors, the report recommends checking foliage, leaf undersides and stem joints for signs of pests. Look for white, fuzzy patches that may indicate mealybugs, fine webbing associated with spider mites, or hard bumps that may be scale. Sticky residue, known as honeydew, can also point to sap-feeding pests such as aphids or scale. An inspection does not guarantee a plant is pest-free, so regular checks after the move remain useful.
For visible infestations, the report says gardeners can first rinse plants with a strong spray from a garden hose, repeating every few days. If that does not work, it suggests insecticidal soap or neem oil, with a clear caution: follow the product label, since some plants can be damaged by these treatments. The report advises treating affected plants and repeating treatment after seven to 10 days, depending on the pest. It also recommends showering foliage even when no pests are apparent, then watering the pot thoroughly to flush unwanted insects from the soil.
Keep newly moved plants apart from established indoor plants for at least three to four weeks, checking them weekly or every 10 days for signs of pests. Other preparations depend on the plant: pruning tropical hibiscus or mandevilla by about one-quarter to one-third may help manage size, while a root-bound plant may need a pot roughly two inches wider and fresh potting medium. The report advises against bringing in plants that are badly struggling; a cutting may offer a way to preserve a favored specimen without moving a large pot.
Cold, Pests and Indoor Light
Moving plants inside protects cold-sensitive varieties, but the change in conditions can create new problems. Even a bright indoor window provides less intense light than outdoor conditions, including shade or part shade. Plants may respond to lower light with yellowing leaves and leaf drop. Some adjust within a few weeks, according to the report, but prolonged decline may be a concern for prized plants.
The move can also bring outdoor pests into contact with an indoor collection. A quarantine period gives gardeners time to spot insects before they spread to established plants. Meanwhile, shorter days and slower growth change how much care plants need: watering routines should be reassessed, and most plants generally do not need fertilizer during winter dormancy or slowed growth. These steps can help protect both the returning plant and the plants already inside.
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Summer Outdoors, Winter Indoors
Some gardeners move houseplants outdoors during warm months to give them more light and warmth. The Country Living report focuses on the return indoors as temperatures fall, rather than setting a single calendar date: local nighttime conditions and forecasts determine when to act. It identifies temperatures in the 40s as the point to watch for most houseplants, while warning that some may be sensitive even to temperatures in the 50s.
Light and temperature are not the only differences between the two settings. Heated homes can dry potting mix faster, while reduced winter light often means plants use water more slowly. The report advises checking soil about once a week and feeling it before watering, rather than continuing the outdoor schedule. It also says that plants growing under LED grow lights may be an exception to the general advice to hold fertilizer, because those lights can support new growth during winter.
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Plant Needs Vary by Species
The temperature guidance is general, not a guarantee for every plant. The report says most houseplants should come in as nights approach the 40s, while some do not tolerate temperatures in the 50s; it does not provide a species-by-species temperature list. Exact thresholds vary, so gardeners should account for the plant, local forecast and conditions where pots are kept.
The report also does not identify a single pest treatment suitable for every plant. It warns that some plants can be burned by insecticidal soap or neem oil, and treatment timing depends on the pest. A rinse may be enough for some soft-bodied insects, but the outcome of any treatment is not guaranteed. How much water an indoor plant needs also depends on light, potting mix, room conditions and species.
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Monitor Plants Through Winter
After moving plants indoors, check them regularly for pests and signs of stress, especially during the three-to-four-week quarantine. Watch for yellowing leaves or leaf drop as plants adjust to lower light, and check the potting mix before watering. If a plant is not getting enough light, the report suggests considering an LED grow light, particularly for a prized plant.
As winter conditions continue, adjust care to the plant’s response rather than relying on its summer routine. Most plants can go without fertilizer while growth slows, but plants under grow lights may continue growing. If cold weather is forecast before preparations are complete, bringing susceptible plants inside promptly is the report’s practical priority.
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Key Questions
When should I bring houseplants inside?
The Country Living report recommends bringing most outdoor houseplants inside when nighttime temperatures begin falling into the 40s. Move them in sooner if frost or a freeze is forecast, and remember that some plants may be sensitive to temperatures in the 50s.
How long should I keep a returning plant separate?
Keep it away from other houseplants for at least three to four weeks. Check it weekly or every 10 days for signs of pests, since insects may not be visible at first.
Should I water houseplants as often indoors as outdoors?
No. Lower light and slower winter growth can change how quickly a plant uses water. Check the soil about once a week and feel it before watering; the report advises against keeping the mix persistently soggy.
Can I use neem oil or insecticidal soap on every plant?
No treatment is suitable for every plant. The report warns that some plants can be damaged by these products. Follow all label instructions and check whether the specific plant tolerates the treatment.
Do indoor plants need fertilizer during winter?
Most plants slow their growth in winter and typically do not need fertilizer, according to the report. Plants growing under LED grow lights may keep putting out new growth and may be an exception.
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