There are a number of plants that are thought to have mosquito repellent properties, including: Citronella: Citronella is a commonly used mosquito repellent and is found in many commercial products. It is also used in some plants that are marketed as mosquito repellent, such as citronella grass and citronella geraniums. These plants can release a strong citronella scent when their leaves are crushed or when they are burned as a natural insect repellent. Marigolds: Marigolds are thought to have mosquito repellent properties due to their strong scent. Lavender: Lavender is known for its pleasant scent and is thought to have some effectiveness as a mosquito repellent. Basil: Basil has a strong, pungent scent that is thought to deter mosquitoes.