Geraniums can be overwintered

By Bill Geer

Published: November 17, 2008

Q: How can I keep my geraniums over winter?

A: Although geraniums can be overwintered, this can result in carry-over of diseases and insect pests from year to year.

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So, it may be best to buy new plants each spring. Gardeners wishing to overwinter their geraniums can try several techniques:

→Take cuttings in the fall and keep the small, potted plants on a windowsill with a bright, sunny southern exposure during the winter. Large geraniums can be dug from the garden before the first frost and planted in pots large enough to accommodate their root system. Cut the top of the plant back to 6 inches in height, and place in a sunny area such as a heated porch.

→An old method of overwintering geraniums is to dig the plants before the first frost, knock the soil from their roots, and hang the plants upside down in a cool, moist room with 80 percent humidity and temperatures between 35 to 45 degrees where they will not freeze. If plants begin to dry out, periodically take them down and soak the roots in water. In spring, take the plants down, cut off ½ to ¾ of the top growth, and replant outdoors.

Bill Geer is director of the Oklahoma County Extension Service. His column addresses frequently asked horticulture questions. For information, call 713-1125.

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