Answer: There are two types of plants that are called mosquito plants. One is a member of the geranium family that was genetically engineered to incorporate the properties of citronella. Citronella only grows in tropical places, but it is a well known repellant for mosquitoes. This plant was created to bring the repellant properties of citronella into a hardier plant. It will grow where any geranium will thrive. Many have questioned its usefulness as a mosquito repellant, but it is attractive enough to warrant planting for it's ornamental value.
The other kind of mosquito plant is agastache cana. Its common names include Texas hummingbird mint, bubblegum mint, giant hyssop, or giant hummingbird mint. As you might guess, hummingbirds are quite attracted to it. It is a New Mexico native, also found in parts of Texas. It is, in fact, a member of the mint family and its leaves do have a pungent aroma when crushed. In its native habitat, it is perennial, and is usually hardy in USDA Zones 5a-9a. It blooms late summer to early fall, so it catches hummingbirds on their annual migration. The long, medium pink flowers reel in butterflies as well.
One of the most powerful mosquito repellant plants is ordinary catnip. Recent studies have shown that it is ten times more effective than DEET at repelling mosquitoes. It is a short lived perennial throughout most of the United States. It is easy to grow from seed, and quickly reseeds. Aside from its intoxicating effects on cats, the leaves make a very soothing tea.
With all of these plants, the leaves must be crushed to release the aroma. Otherwise mosquitoes can't smell them. And, with rosemary and catnip, you can simply crush a few leaves and rub on your skin and clothing to enhance the effect.
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