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.

Pelargonium graveolens Citrosa, also known as the lemon geranium or mosquito plant, is highly prized for its ability to repel the mosquito, Culiseta longiareolata. At least it is highly prized by ...