Lavender plants (Lavandula) are a very popular flower. Not only grown for their beauty, but also their scent. Lavender is grown and used for things like candles and perfume. Some grow Lavender and dry it out to later be used for sachets.
It is used in so many different products because it is usually known as a calming scent. When people need to relax after a long day, some recommend burning a lavender candle, or soaking in a lavender scented tub to relax.