Lemongrass is a favorite of American gardeners. This fragrant grass is a versatile performer in the kitchen and equally versatile in the garden. This tropical grass grows in dense clumps that can grow to 6 ft (1.8 m) in height and about 4 ft (1.2 m) in width. The strap-like leaves are 0.5-1 in (1.3-2.5 cm) wide about 3 ft (0.9 m) long, and have gracefully drooping tips. The evergreen leaves are bright bluish-green and release a citrus aroma when crushed. It produces an attractive purplish seed head in most areas. Lemongrass is adapted to hot wet summers and dry warm winters, it is drought tolerant and will grow on a wide range of soils but prefers rich, moist loams. It is the leaves that are used as flavoring and in medicine. They are steam distilled to extract lemongrass oil, an old standby in the perfumer's palette of scents. The lemongrass plants that you are likely to encounter are cultivars and do not typically produce flowers.
Sources: Lemongrass Herbal Information from Herbal Extracts Plus, http://www.herbalextractsplus.com/lemongrass.html (accessed January 24, 2017).