The mosquito plant--also known as the citrosa plant or mosquito geranium--is a hybrid of Chinese citronella and African geranium. The plant produces citronella oil, which is a natural mosquito repellent. The plant is a prolific grower, and home gardeners can propagate new plants from the original one with very little effort.
Clip a cutting at least 4 inches long from the mosquito plant. Use gardening shears so that the wound is smooth and clean. Make sure that there are at least three sets of leaves on the cutting.
Remove the lower set of leaves from the plant's stem. If you want to use rooting powder, dip the stem into the powder. This is optional, as mosquito plants root easily without rooting powder.
Fill a cup with damp perlite, and push the mosquito plant stem into it. Wait a few weeks to allow root systems to develop.
Fill a flower pot with high-quality potting soil. Plant the newly rooted plant cutting into the center of the soil. Water immediately, to help the roots push trapped oxygen bubbles to the surface.