Lemongrass (Cymbopogon citratus) is a tropical perennial grass prized globally for its intense citrus aroma and flavor. A staple in Asian cuisines, it is also widely utilized for its fragrant essential oils. While native to southern India and Sri Lanka, its cultivation has spread across tropical and subtropical zones. Its appearance is distinct among herbs, resembling an ornamental grass with a unique, harvestable base.
Overall Growth and Clumping Habit
The lemongrass plant exhibits a dense, tight growth structure, forming a substantial clump rather than spreading via runners like turf grass. This cespitose habit means multiple stiff, upright stems grow closely together from a short underground rhizome. When mature, a single plant can reach an impressive height, typically between 3 and 5 feet, creating a lush, fountain-like display.
The plant expands outward by tillering, where new shoots emerge close to the main base, increasing the overall diameter of the clump. Its root system is fibrous and aggressive, helping to anchor the large plant mass and forming a solid base.
The Distinctive Stalk (The Edible Part)
The base of the plant, often referred to as the stalk, is the most recognizable and flavorful part used in cooking. This section is rigid and firm, composed of multiple layers tightly wrapped around an inner core, much like a leek or spring onion. The outermost layers are typically tough and woody and must be peeled away before use.
A clear color gradient marks the stalk, beginning with a pale white, ivory, or sometimes a slight pink/purple hue at the bottom. This color gradually transitions to a pale green as it extends upward. Only the bottom three to four inches are tender enough to be finely chopped and eaten, as the upper, greener portion is too fibrous.
Characteristics of the Foliage
The leaves of lemongrass are long, slender, and arch gracefully outward from the central clump. Their color ranges from a bright, vibrant green to a slightly bluish-green hue.
The leaf blades are linear with sheathed bases and have a somewhat rough texture, sometimes possessing sharp edges. When these leaves are crushed or bruised, they immediately release the plant’s characteristic lemon scent. The foliage is generally evergreen in tropical climates, maintaining its appearance throughout the year.