The plant marketed as the citronella, or mosquito plant, is Pelargonium citrosum, a scented geranium. Citronella is extracted by steam distillation from two species of grasses: Cymbopogon nardus ...

Propagation is done by tissue culture. Citrosa is a cross between Pelargonium graveolens, a rose-scented geranium, and Cymbopogon nardus, a grass that’s the source of the oil of citronella.

The bestsellers are the citronella-scented geranium (Pelargonium citrosum) and the rose-scented geranium (Pelargonium graveolens) - both dubbed "mosquito plants" as their scents are believed to ...