Does the Mosquito Plant Really Repel Mosquitos?

The mosquito plant is advertised as a natural mosquito repellent in popular seed catalogs and gardening magazines. This scented geranium releases a burst of citronella scent when leaves are disturbed. But, does it really repel mosquitoes?

According to an article published in Organic Garden in July/August 1992, the mosquito plant may provide some protection from mosquitoes, but the claims have been greatly exaggerated. In fact, according to plant fragrance specialist Arthur Tucker of Delaware State College in Dover, the mosquito plant contains a mere 0.09 percent of citronella, the main ingredient in citronella oil.

Both lemon balm with 38 percent citronella, and lemon thyme are reported to be a more effective natural repellents for mosquitoes. The crushed leaves of the mosquito plant provides 30 to 40 percent of the repellency of DEET, but lemon thyme provides a whopping 62 percent.

Advantages of Mosquito Plants as Natural Mosquito Repellents

The mosquito plant offers the advantage of attractive foliage and delicate blooms and can be grown in a pot on a sunny windowsill. This tender plant must be overwintered in the house, but does make an attractive houseplant. The lacy green leaves that release a burst of lemony scent add freshness to the home. Simply brush the leaves to release fresh scent to fragrance the home.

Herbal Mosquito Repellents: Lemon Thyme and Lemon Balm

Lemon balm and lemon thyme are perennial herbs that thrive in the garden and are hardy to subzero weather. A small plant purchased at the nursery and planted in a sunny location provides years of enjoyment and has many culinary uses, as well.

Lemon thyme trails over the sides of window boxes or raised bed with its tiny green and yellow foliage. When in bloom it attracts bees and butterflies. Lemon balm emerges early in the spring with its green scalloped foliage creating mounds of dense green.

How to Use Natural Mosquito Repellents

Neither the mosquito plant, lemon balm nor lemon thyme repel mosquitoes simply sitting in a pot or planted in the garden. Leaves must be crushed to release enough scent to repel mosquitoes.

To use these herbs as natural mosquito repellents, harvest leaves and crush to release the citronella fragrance. Rub the crushed leaves on the skin for a natural mosquito repellent free of nasty chemicals. Iowa State University cautions that you should test a small area of skin for irritation or allergic reaction before using herbal insect repellents.

Although the mosquito plant is not the best choice for a natural mosquito repellent, it is an attractive plant. When planted in pots on the deck or near walkways, simply brushing against the plant releases a burst of fresh lemony scent. This plant is worth adding to your collection of summer plants, but don't rely on it as your main source of mosquito repellent.

SOURCES:

Iowa State University: Mosquito Repellent Plants

North Carolina State University Extension: Geranium Culture for Home Gardeners