Commonly known as the "Mosquito Plant" or "Citronella Geranium," this herb is a type of scented geranium that is often marketed as a mosquito repellent. 
Physical Description:
Leaves: The leaves are deeply lobed and have a strong citrus or citronella fragrance when crushed. They are often green and may resemble those of other geranium varieties.
Uses:
Mosquito Repellent: Pelargonium citrosum is often sold as a plant that repels mosquitoes. While it does contain some compounds with insect-repelling properties, its effectiveness as a mosquito deterrent is a subject of debate. Some people find that the plant's fragrance helps in keeping mosquitoes at bay, while others may not experience the same results.
Aromatic Qualities: The primary appeal of Pelargonium citrosum lies in its aromatic leaves. The plant is often grown for its pleasant fragrance, and some people use the leaves in potpourris or as a natural air freshener.
Growing Conditions:
Soil: Well-drained soil is essential. Pelargonium citrosum prefers slightly acidic to neutral soil.
Watering: Keep the soil consistently moist but not waterlogged. Allow the top inch of soil to dry between waterings.
Sunlight: Pelargonium citrosum thrives in full sun to partial shade. It should receive at least six hours of direct sunlight daily.
Hardiness: In terms of hardiness, it is often grown as an annual in colder climates but can be a perennial in warmer regions.
Harvesting:
Harvest leaves as needed for their fragrance or for potential mosquito-repelling properties.