Welcome to the Flower & Garden board, Girls Scout Leader!
The Citronella Plant (or Mosquito plant) was popular in the garden centres around here this year, perhaps partly due to the fears of West Nile Virus. It looks pretty good too!
Since it's related to the common garden geranium, the following info on propagation might help you out.
Propagation Most geraniums root easily from stem cuttings, and many cultivars must be vegetatively propagated to maintain desired flower and/or leaf color, shape and scent. Propagate in the fall, allowing for 3 to 4 weeks of frost-free weather for rooting to take place. Take cuttings from September (mountains) to October (Coastal Plain) from healthy mother plants which have been kept rather dry for several weeks. Take cuttings 3 to 4 inches in length from the growing tips of branches. Trim off the leaves from the base of the cutting, stick them into a coarse, sandy medium in small pots or flats, and water well. Provide indirect light and do not allow the cuttings to dry out. After roots are formed, place cuttings in full sun and water only enough to keep the cuttings from shriveling. Keep the surface soil dry to reduce diseases. Fertilize with a water-soluble fertilizer every two weeks.
Overwintering Geraniums Although geraniums can be overwintered, this can result in carry-over of diseases and insect pests from year to year; so it may be best to purchase 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 basement with 80% humidity and temperatures between 35 to 45°F 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 1/2 to 3/4 of the top growth, and replant outdoors.
~Geranium Culture for Home Gardeners~
