Pelargonium citrosa (Mosquito Geranium) is a tender pelargonium often grown for its strongly scented, citrusy foliage and easy-going container performance. You will get the best growth and the strongest fragrance with plenty of light and warm temperatures, and you can enjoy it outdoors through the frost-free season in most regions.
Give your plant full sun to part shade and a well-drained potting mix or garden soil. Water when the top inch or two of soil dries, then water thoroughly and let excess drain away; consistently soggy soil can lead to weak growth. In containers, a pot with drainage holes is essential, and an occasional light feeding during active growth helps keep it full and leafy.
This pelargonium typically matures around 36-48 inches tall with a bushy, upright habit, making it useful as a focal container plant or as a seasonal accent in beds where it can be lifted before cold weather. Pinching back tips early in the season encourages branching and a denser shape, and removing spent flowers and leggy stems keeps it looking tidy.
Because it is not cold hardy in most climates, plan to bring it indoors before frost if you want to overwinter it. Set it in a bright window, reduce watering, and keep it on the dry side until spring returns.