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Uninvited Houseguests

- Don't let them in in the first place! -

Summary: A number of critters find their way into our homes by hitching a ride on houseplants moved indoors in the fall. Check plants carefully and clean the leaves before the move and you'll stop this freeloading!

Jack DeAngelis, PhD
OSU Ext. Entomologist (ret.)

Many gardeners move potted plants from outdoors to indoors every fall to protect them from winter weather. For example you may have a potted jade plant that does fine on the deck from April to September but would die if exposed to even moderately cold fall weather. In fact, potted houseplants often do better if given this yearly exposure to outside sun and air.

Be aware, however, that you may introduce some uninvited houseguests indoors by this practice. Slugs, root weevils and spiders are notorious for hitching a ride on these plants. As the plants warm up the critters become active and will often move off the plants. These houseguests pose no threat whatsoever unless, of course, the spiders happen to be one of the very few poisonous species in your area. So, if you find slugs or root weevils wandering across the floor this winter they probably came off that potted plant you moved indoors.

grey garden slug
The grey garden slug may be carried into homes on houseplants.
 

One solution is to give the plants a "bath" before moving them indoors. On a warm day in early fall hose the plants off with water then spray with insecticidal soap, wait 30 minutes then rinse with water. Allow the plants to dry completely. This procedure will also remove any dirt, aphids and spider mites that you also don't want to take indoors. If you have time, tip the plants out of their pots and check for slugs hiding around the pot's drain holes.

Small greenhouses are an ideal solution for protecting non-hardy plants during winter. Even if the greenhouse is unheated the enclosure will protect many plants from the harsher winter extremes. This, of course, depends on the climate, and plants involved, and will require some experimentation.

Other "uninvited houseguests", not associated wth moving potted plants around, include cluster flies, boxelder bugs and Harmonia lady beetles. See these individual pages for more information.

The Pest Management Store

Identification guides, reference and gardening books, etc.

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Mission: To provide accurate, up-to-date and unbiased information for solving common insect and mite problems around your home, business and landscape using least-toxic methods.

Jack DeAngelis, Ph.D.

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