Bringing plants inside should happen before nighttime temperatures drop below 50°F to prevent cold shock and leaf damage. Knowing exactly when to bring plants inside can save your outdoor greenery from sudden frost and keep them thriving through the colder months. This guide covers the precise timing, step-by-step preparation, and common mistakes to avoid.
When To Bring Plants Inside
The short answer is: bring them in before the first frost or when nighttime temps consistently fall below 50°F. But the exact timing depends on your plant type, your local climate, and the weather forecast. Most tropical and tender plants can’t handle temps under 50°F for long.
Check your local frost dates online. For many regions, that means acting in late September or early October. But don’t wait for a frost warning—cold damage can happen even above freezing.
Temperature Thresholds For Common Plants
Different plants have different cold tolerances. Here’s a quick guide:
- Tropical plants (hibiscus, bougainvillea, ferns): Bring inside when temps drop below 50°F
- Succulents and cacti: Move indoors when temps fall below 45°F
- Herbs (basil, cilantro, mint): Bring in before temps hit 40°F
- Hardy perennials (lavender, rosemary): Can tolerate down to 30°F but still need protection
- Citrus trees: Bring inside when temps drop below 55°F
Always err on the side of caution. A few cold nights can stunt growth or kill sensitive plants.
Signs Your Plant Needs To Come Inside
Watch for these warning signs:
- Leaves turning yellow or brown at the edges
- Wilting even when soil is moist
- Drooping stems or leaves
- Sudden leaf drop
- Blackened or mushy spots on leaves or stems
If you see any of these, bring the plant inside immediately. But prevention is better—don’t wait for damage.
How To Prepare Plants For Indoor Transition
Moving plants indoors isn’t just about temperature. You need to prepare them for lower light, less humidity, and potential pests. Follow these steps for a smooth transition.
Step 1: Inspect For Pests
Before bringing any plant inside, check every leaf, stem, and soil surface. Common pests include aphids, spider mites, scale, and mealybugs. Look under leaves and along stems.
If you find pests, treat the plant with insecticidal soap or neem oil. Repeat treatment a week later. Quarantine the plant for 2-3 weeks if possible.
Step 2: Prune And Clean
Remove dead or yellowing leaves. Trim back leggy growth. This reduces stress and helps the plant adapt to lower light indoors.
Wipe down leaves with a damp cloth to remove dust and any hidden pests. Clean leaves also absorb more light.
Step 3: Repot If Needed
Check if the plant is root-bound. If roots are circling the pot or coming out of drainage holes, repot into a slightly larger container. Use fresh potting soil.
But avoid repotting right before moving indoors—it adds stress. Do it 2-3 weeks before or wait until spring.
Step 4: Adjust Light Gradually
Plants need time to adjust from bright outdoor light to dimmer indoor conditions. Start by moving the plant to a shaded outdoor spot for a few days. Then bring it inside for a few hours each day, increasing indoor time over a week.
This gradual transition prevents leaf drop and shock.
Step 5: Water Carefully
Indoor plants need less water than outdoor ones. Overwatering is a common mistake. Water only when the top inch of soil feels dry. Use room-temperature water to avoid shocking roots.
Reduce fertilizing too. Most plants don’t need fertilizer during winter dormancy.
Best Indoor Locations For Your Plants
Where you place your plants indoors matters a lot. Here’s how to choose the right spot.
Light Requirements
- South-facing windows: Best for succulents, cacti, and tropical plants that need bright light
- East-facing windows: Good for ferns, peace lilies, and low-light plants
- West-facing windows: Bright afternoon light, good for flowering plants
- North-facing windows: Low light, suitable for snake plants, pothos, and ZZ plants
If you don’t have enough natural light, use grow lights. Place them 6-12 inches above plants and run them 12-16 hours a day.
Humidity And Temperature
Indoor air is often dry, especially with heating. Most tropical plants need humidity above 50%. Increase humidity by:
- Grouping plants together
- Using a humidifier
- Placing pots on trays of pebbles and water (don’t let pots sit in water)
- Misting leaves occasionally
Keep plants away from drafts, heating vents, and cold windows. Ideal indoor temps are 60-75°F during the day and slightly cooler at night.
Avoiding Drafts And Heat Sources
Don’t place plants near radiators, fireplaces, or air conditioning units. Sudden temperature changes stress plants. Also avoid spots where cold air seeps in from windows or doors.
Common Mistakes When Bringing Plants Inside
Even experienced gardeners make errors. Here are the most common ones to avoid.
Bringing Plants In Too Late
Waiting until the first frost is risky. Cold damage can occur before frost forms. Check the forecast and act early.
Not Quarantining New Plants
If you bought new plants for indoor display, keep them separate from your existing plants for 2-3 weeks. Pests can spread quickly.
Overwatering Indoors
Indoor plants dry out slower than outdoor ones. Stick your finger in the soil before watering. If it’s still damp, wait.
Ignoring Pests
Even if you inspected, some pests hide. Check plants weekly for signs of infestation. Early action prevents outbreaks.
Placing Plants In Wrong Light
A plant that thrived in full sun outdoors may struggle in a dim corner. Match light needs carefully. Use grow lights if needed.
Transitioning Plants Back Outdoors In Spring
The process reverses in spring. Wait until nighttime temps stay above 50°F. Gradually acclimate plants to outdoor conditions over 1-2 weeks. Start with a few hours of shade, then increase sunlight and time outdoors.
This hardening-off process prevents sunburn and shock. Don’t rush it.
Frequently Asked Questions
Can I Leave Plants Outside If It Gets Below 50°F For One Night?
It depends on the plant. Tropical plants may suffer damage after just one night below 50°F. Hardy plants might survive, but it’s not worth the risk. Bring them in if temps are forecast to drop below 50°F.
Should I Bring Plants Inside If It’s Raining But Warm?
Rain alone isn’t a reason to bring plants inside. But if temps are dropping or a cold front is coming, move them indoors. Wet soil can make plants more vulnerable to cold damage.
How Do I Know If My Plant Is Cold Shocked?
Signs include wilting, leaf drop, blackened or mushy leaves, and stunted growth. If you see these, bring the plant inside immediately and trim damaged parts. Recovery may take weeks.
Do All Plants Need To Come Inside For Winter?
No. Hardy perennials, some shrubs, and cold-tolerant plants can stay outside if mulched and protected. Check your plant’s hardiness zone. Tender plants, tropicals, and succulents usually need indoor protection.
Can I Use A Garage Or Shed For Overwintering Plants?
Yes, if the space stays above 40-50°F and has some light. Many plants go dormant in cool, dark spaces. But check periodically for pests and water very sparingly.
By following these guidelines, you’ll know exactly when to bring plants inside and how to keep them healthy all winter. Start monitoring temperatures now, and don’t wait until the last minute. Your plants will thank you with lush growth come spring.