How to Debug Plants Before You Bring Them Indoors For Winter

Updated 11/08/19

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When warm weather comes around, it’s a great idea to bring your sun-loving houseplants outside to your yard, deck, or balcony catch some extra rays. Once temperatures cool and days shorten, however, you’ll want to bring your plants inside.

But this process isn't as simple as simply carrying your plants back indoors. You’ll need to help them adjust to the lower-light indoor environment and make sure they’re not bringing any pests, diseases, dead growth, or unwanted dirt in with them. Here's how to get your plants bug-free and ready to come inside for the winter.

What You Need to Debug Your Plants

Before you begin, gather the following materials.

  • Gardening gloves
  • Fresh potting soil
  • Pruning shears
  • Rubbing alcohol
  • Cotton swabs or balls
  • Mild soap like Dr. Bronner's
  • Large bucket or tub
  • Scrub brush
  • Small strainer with handle
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When to Bring Plants Indoors

If your region experiences temperatures below 50 degrees or so at night in the winter, you’ll need to bring potted plants inside. Tropical plants can be damaged at temperatures as low as 45 or 50 degrees, and many succulents can’t survive below 40 degrees.

If you brought your plant outdoors in the spring, you’ll want to bring it back in when fall comes around. 

Before bringing plants back inside for the winter, clear space for them on window sills and counters. If necessary, purchase new plant stands, plant saucers, and maybe even a new floating shelf. Add ceiling hooks or plant hangers as needed if you have hanging baskets. It’s also a good idea to wash your windows inside and out so that you can maximize the light coming through in the winter months. 

It’s best to start acclimating your plants to the lower-light conditions of your home before temperatures require you to bring them indoors. Two weeks before you estimate you’ll need to bring plants inside, begin moving them a little closer to your house each day, in spots with bright, indirect light rather than full sun. 

How to Treat Plants Before Bringing Them Indoors 

When you’re finally ready to bring your plants inside, plan to spend an afternoon (or a day, depending on how many plants you have) getting them ready. Identify any plants that need to be repotted. Cut back up to a third of root growth before repotting them with fresh soil.

Use clean, sharp pruning shears to cut back any dead or damaged growth. You can also cut back up to a third of the plant if it has become overgrown during the summer.

Take care to sanitize the shears by wiping the blades down with a cloth or cotton ball soaked in rubbing alcohol between plants.

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How to Debug Your Plants

Before debugging the aerial portion of your plant, you’ll want to push out any insects that may have burrowed into the soil. Take note that this method only works with plant containers that have drainage holes.

Fill a tub or bucket large enough to submerge your plant’s container with tepid water. Soak the container in the water for around 15 minutes to push any pests out of the soil. Skim the debris and any insects floating on the surface of the water with the strainer and discard. Remove the pot from the bucket and allow it to drain for an hour. 

While the soil drains, inspect the leaves and stems of each plant for insects like scale, aphids, spider mites, or mealybugs. Aphids, which are tiny, light-green bugs, can be washed off with a mix of mild liquid soap and water; the soap will kill the aphids on contact. Use a cotton ball or swab dipped in rubbing alcohol to wipe away scale (brown, flat ovals on leaves and stems) and mealybugs. 

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Tiny spider mites often form webs on the undersides of leaves, but are so small they may be difficult to see. Look for light brown feeding spots on plants as a sign of spider mites. Spray leaves with a hose to remove spider mites, then treat the plant with insecticidal soap to remove any remaining mites. 

Keep in mind that it may be best to cut off a particularly infested portion of the plant—but avoid removing more than a third of its growth. If an infestation is extreme or you can’t remove all the insects from the plant with these methods, it’s best to throw the plant away and purchase a new one rather than risk bringing pests inside to infest your other houseplants.

Avoid composting infested plants or plant material—always bag the plant material and put it in the trash to avoid spreading pests. 

After debugging your plants, give the outside of your pots a good scrubbing with a brush and soapy water. Rinse the containers off and let them dry outdoors, then bring them inside. To start, keep them in the sunniest window in your home before gradually moving them to their usual indoor spot over the next few weeks to help them acclimate to the lower light conditions indoors. 

Care for your houseplants as usual, keeping in mind that with less light and cooler temperatures in winter, your plants may need to be watered a little less frequently. Keep an eye on soil moisture, and monitor the leaves and stems for signs of pests. If pests return, treat as described above to remove them.

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