DIY Citronella grass for your yard Citronella grass is a "clumping" grass that grows between 5 and 6 feet tall, so it makes a great border for any property line or works well as an accent in gardens. And since it's the stuff that store-bought citronella candles are mimicked after (careful, though, because those often don't have any actual citronella in them, but instead are citronella "scented"), why not go with the real deal?
