Lavender is known for its herbaceous, sweet, floral aroma imparting a clean and soothing fragrance.
A hydrosol is the aromatic water remaining after producing an essential oil via steam distillation. Steam distillation results in two complementary products - the essential oil and the hydrosol.
When the plant material is brewed with water in the cooker, steam fills the pot, and as it rises, causing the plant's glands to release its oils and essence into the steam. The aromatic water that was steamed with the original plant material is referred to as a "hydrosol", which is like a much less concentrated essential oil. During this distillation process, the plant matter actually imparts the hydrosol with the water-soluble aromatic and therapeutic properties of the plant. They contain the essence of the plant in every drop, just like essential oils, but in a milder form.