Citronella and Lemongrass are cousins. They almost look the same, they grow the same way, and as essential oils, they are processed the same manner. But do you know how to distinguish Citronella from Lemongrass while they're still plants?
Actually its very easy.
Citronella has pseudostems that are colored reddish. Lemongrass, on the other hand, is green. If you'd be planting both grasses in your gardens, you should know these so that if you're picking Lemongrass for tea time, you won't mistake Citronella for it.