Bring tender plants inside when nighttime temperatures consistently drop below 50 to 55 degrees Fahrenheit (10 to 13 degrees Celsius).
This is a crucial step for protecting your plants, especially those considered "tender" or those not native to your climate. Even if a plant is technically hardy in your growing zone, the roots of container-grown plants are more exposed to the elements and can be more susceptible to cold damage than when planted directly in the ground.
Here's a breakdown of factors to consider:
- Temperature Threshold: 50-55°F (10-13°C) nighttime lows are the key trigger. Don't wait for frost!
- Plant Type: Prioritize bringing in tender plants first. These are plants that are easily damaged by cold temperatures. Examples include:
- Tropical plants (e.g., hibiscus, bougainvillea)
- Annuals that you want to overwinter (e.g., geraniums)
- Succulents and cacti (many are surprisingly cold-sensitive)
- Container Plants vs. In-Ground Plants: Container plants are more vulnerable to cold snaps as their roots are less insulated.
- Acclimation: If possible, gradually acclimate your plants to indoor conditions by bringing them in during the evening and returning them outdoors during the day for a week or two. This reduces stress.
- Pest Inspection: Before bringing your plants indoors, thoroughly inspect them for pests and diseases. Treat any infestations before they spread to your other houseplants.
- Location, Location, Location: Choose an indoor location that provides adequate light for your plants. South-facing windows are typically ideal, but consider supplemental lighting if needed.
Bringing your plants indoors at the right time is key to ensuring their survival through the colder months and enjoying their beauty again next spring.
