Moving Houseplants Back Indoors

Tom Weaver —  September 23, 2017 — 3 Comments

In spite of the recent 90 degree temperatures, it’s time to start thinking about moving your houseplants inside.

The best time to do this is when temperatures outside are relatively close to the temperatures indoors, meaning mid- to late September. Before you move everything in, however, there are four quick steps you’ll want to take to help ensure a successful winter of windowsill gardening.

The same care tips also apply to overwintering tropical plants such as palms and bromeliads

The same care tips also apply to overwintering tropical plants, such as palms and bromeliads.

1. Clean up any dead or damaged growth.

Why bring any additional mess indoors when you don’t have to? Carefully remove any broken branches, sunburned leaves, or otherwise unsightly growth from your plants.

2. Lightly trim back plants as needed.

This step is a bit optional, and you really only need to do it if your plants have become large and overgrown. Never remove more than one-third of the growth at a time. Removing more can stress the plant and send it into shock, which can be hard to recover from indoors.

3. Check thoroughly for pests, and treat as needed.

One of the biggest ways to set yourself up for success is to start with clean plants. There are several pests that can cause problems indoors. The most common are mealybugs, spider mites, scale, and aphids. Insecticidal soap is a lower toxicity insecticide that is safe for most houseplants and will take care of nearly any pest problem you might have. As with any chemical, make sure to follow all package instructions. It is NOT recommended to use soapy water—this eats away at the cuticle (a protective waxy layer on the leaf), making it more vulnerable to disease problems in the future. For specific pest recommendations, contact our Plant Information Service.

Large-leaved plants are particularly susceptible to spider mites.

Large-leaved plants are particularly susceptible to spider mites.

Spider mites can also cause brown edges that mimic sunburn. Look for the telltale webbing to determine if you have mites.

Spider mites can also cause brown edges that mimic sunburn. Look for the telltale webbing to determine if you have mites.

Mealybug feeding on the stem of Dioscorea elephantipes

Mealybug feeding on the stem of Dioscorea elephantipes

Sunburn causes brown spots on leaves.

Sunburn causes brown spots on leaves. Trimming off damaged leaves helps keep plants looking good all winter.

4. Finally, resist the urge to repot unless necessary.

Sometimes plants have simply grown too large for their pots, in which case it’s OK to repot. But don’t repot if the plant doesn’t need it, as this will add unnecessary stress that could harm the plant in the long term. Always use soil specifically for containers (potting soil). Black dirt is too heavy and will encourage rot. When repotting, select a new pot that’s only 1 or 2 inches larger in diameter. Anything much larger than that will encourage rot because the soil will stay wet for a long time.


©2017 Chicago Botanic Garden and my.chicagobotanic.org

Tom Weaver

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Tom Weaver is a horticulturist and takes care of the Dwarf Conifer Garden and Waterfall Garden. He has a bachelor's degree in environmental horticulture from the University of Minnesota, Twin Cities Campus. His favorite groups of plants are hardy cacti and anything with chartreuse foliage.

3 responses to Moving Houseplants Back Indoors

  1. thank you for these timely and informative notes!!!—It takes a village!

  2. Very helpful article.How do I rid my plants of fungus gnats? Ive tried repotting with all new soil, using sticky tapes, insecticidal soap, letting the soil dry out and almost killing my plants, fly traps with little results.Please help.

    • Hi Eileen! Since it seems like you have tried everything, perhaps this simple method may work: add a ½-inch layer of sand on top of the existing potting soil. This method may work by preventing both the gnats from penetrating the soil and laying eggs and the hatched larvae from escaping. Another consideration is the possibility that the fungus gnats may not be coming from this particular houseplant, but rather another damp source where they can reproduce. If you have any additional questions, you can reply here or contact Plant Information Service at plantinfo@chicagobotanic.org

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