Mosquito repellent grass is able to repel mosquitoes, because the geraniol, citronellol, citral and other substances in this type of plant have a certain effect of avoiding insects.

But the odor emitted by the leaves alone is not enough to repel mosquitoes, and it is only when it is chewed or broken that a large amount of odor is released. That's why it's effective when planted in a large enough area to reach a certain concentration of scent in the air.

In reality, the mosquito repellent plants have basically no effect on mosquitoes. In fact, this kind of plant secretion of geraniol, citronellol, citral and other substances do have a certain role in avoiding insects, but only rely on the odor emitted by the leaves to repel mosquitoes, its concentration is far from enough. Moreover, these substances will only be released in large quantities when the plant is nibbled and other physical damage.

The mosquito repellent grass sold on the market are genetically modified plants. Internet rumor mosquito repellent grass is by the Dutch geneticist Dick through genetic engineering technology, citronella citronellal gene into the fragrant leaf geranium obtained. However, there is no relevant documentary evidence to prove its authenticity.