Lemongrass (Cymbopogon citratus) is a tall, aromatic perennial grass belonging to the Poaceae family, prized worldwide for its culinary, medicinal, and ornamental value.
• Native to tropical and subtropical regions of South and Southeast Asia
• Widely cultivated across tropical regions of Asia, Africa, and the Americas
• Known by many common names including "silky heads," "citronella grass," and "fever grass"
• The genus name Cymbopogon derives from Greek "kymbe" (boat) and "pogon" (beard), referring to the boat-shaped spathes enclosing the flowers
• Has been cultivated in India and Southeast Asia for thousands of years for culinary and medicinal purposes
• Spread to tropical Africa, the Americas, and the Caribbean through trade and colonial expansion
• The genus Cymbopogon comprises approximately 55 species distributed across tropical and subtropical regions of Asia, Africa, and Australia
• Center of diversity lies in the Indian subcontinent and Southeast Asia
• Plays a significant role in Ayurvedic and traditional Southeast Asian medicine systems
Rhizome & Stems:
• Grows in dense clumps from a basal rhizome system
• Stems are erect, solid (unlike many hollow-stemmed grasses), and composed of tightly wrapped leaf blades
• Base of stem bulbous, pale green to whitish, and is the primary edible portion
• Stems exude a strong lemony fragrance when crushed due to high citral content
Leaves:
• Linear-lanceolate, 60–100 cm long and 1–2 cm wide
• Light green to blue-green with parallel venation characteristic of monocots
• Margins are rough (scabrous) — can cause minor cuts if handled carelessly
• Leaf sheaths tightly wrap around the stem, forming the "pseudostem" structure
Flowers & Inflorescence:
• Produces large, loose, compound panicle inflorescences on long stalks
• Flowers are small, arranged in pairs of spikelets enclosed within boat-shaped spathes
• Rarely flowers in cultivation, especially outside tropical climates
• When present, inflorescences can reach 60 cm in length
Root System:
• Fibrous and extensive, spreading horizontally through rhizomes
• Enables rapid vegetative propagation and clump expansion
Climate Requirements:
• Optimal temperature range: 20–30°C
• Cannot tolerate frost; damaged below 10°C
• Requires full sun exposure for vigorous growth
• Performs best in areas with annual rainfall of 1,500–2,500 mm
Soil Preferences:
• Adaptable to a range of soil types from sandy loam to clay
• Prefers well-drained, fertile soils rich in organic matter
• Optimal pH range: 5.5–7.5
• Does not tolerate waterlogged conditions
Ecological Role:
• Dense clump growth habit helps prevent soil erosion
• Strong aromatic compounds (citral, geraniol) act as natural insect repellents
• Used in companion planting to deter certain agricultural pests
Nutritional Profile (per 100g of raw lemongrass):
• Calories: approximately 99 kcal
• Carbohydrates: ~25g
• Protein: ~1.8g
• Fat: ~0.5g
• Fiber: minimal
Key Bioactive Compounds:
• Citral (comprising 65–85% of essential oil) — primary source of lemony aroma
• Geraniol — floral-scented terpene with antimicrobial properties
• Myrcene — aromatic compound with anti-inflammatory potential
• Iron, calcium, manganese, magnesium, and potassium in small amounts
• Vitamin C, vitamin A (as beta-carotene), folate, and niacin in trace quantities
• Consumption of lemongrass tea or culinary use is considered safe for most adults
• Essential oil is highly concentrated and should not be ingested undiluted
• Some individuals may experience skin irritation or allergic contact dermatitis from handling fresh leaves
• Pregnant and breastfeeding women are advised to avoid medicinal doses due to insufficient safety data
• May interact with certain medications including anticoagulants and diabetes drugs
Light:
• Requires full sun — minimum 6–8 hours of direct sunlight daily
• Will become leggy and less aromatic in partial shade
Soil:
• Well-drained, fertile soil rich in organic matter
• pH: 5.5–7.5
• Amend heavy clay soils with compost and sand to improve drainage
Watering:
• Keep soil consistently moist but not waterlogged
• Water deeply once or twice per week depending on climate
• Established plants have moderate drought tolerance
Temperature:
• Optimal growing temperature: 20–30°C
• Will not survive frost; bring containers indoors or harvest before first frost in temperate zones
Propagation:
• Most commonly propagated by division of established clumps
• Select healthy stems with intact root base, trim leaves to 5–8 cm, and plant directly in soil
• Can also be propagated from supermarket stalks — place base in water until roots develop, then transplant
• Division is best done in spring at the start of the growing season
Harvesting:
• Harvest stems when they reach ~1.5 cm thick at the base
• Cut or snap stems at ground level
• Regular harvesting encourages new growth and prevents the clump from becoming woody
Culinary Uses:
• Essential ingredient in Thai, Vietnamese, Indonesian, Malaysian, and Sri Lankan cuisines
• Used in tom yum soup, tom kha gai, curries, satay marinades, and stir-fries
• Bulbous base is sliced, pounded, or minced to release aromatic oils
• Dried and powdered forms used as a convenient seasoning
• Lemongrass tea is a popular herbal infusion consumed for its flavor and digestive benefits
Essential Oil Production:
• Steam distillation of leaves yields lemongrass oil, containing 65–85% citral
• Used in perfumery, cosmetics, soaps, and aromatherapy
• Natural insect repellent — effective against mosquitoes and other biting insects
• Used in candle-making and diffuser blends
Traditional Medicine:
• Used in Ayurveda and traditional Chinese medicine for digestive complaints, fever, and inflammation
• Lemongrass tea is a traditional remedy for colds, coughs, and sore throats
• Essential oil used topically for muscle pain relief
Agricultural & Household:
• Natural pest deterrent in companion planting (repels aphids, whiteflies)
• Used in organic farming as a botanical insecticide
• Aromatic mulch for garden beds
Wusstest du schon?
Lemongrass belongs to the same grass family (Poaceae) as some of humanity's most important staple crops — including rice, wheat, maize, sugarcane, and barley. • The Poaceae family is the fifth-largest plant family with ~12,000 species and provides over 50% of all human caloric intake worldwide • Lemongrass shares the characteristic parallel venation and hollow (or solid) stems typical of grasses Citral — the compound responsible for lemongrass's signature lemon scent — is actually a mixture of two isomeric aldehydes: geranial (trans-citral) and neral (cis-citral). • Lemongrass contains one of the highest natural concentrations of citral found in any plant • The compound was first isolated from lemongrass oil in the late 19th century Lemongrass is one of the easiest herbs to propagate at home: • Simply purchase fresh stalks from an Asian grocery store • Place the base in a jar of water on a sunny windowsill • Roots typically appear within 1–2 weeks • Once roots are 2–3 cm long, transplant into soil • A single stalk can produce a full clump within one growing season The genus Cymbopogon includes several closely related species with distinct aromas: • Cymbopogon citratus (lemongrass) — lemon-scented • Cymbopogon nardus (citronella grass) — used in insect repellent candles • Cymbopogon flexuosus (East Indian lemongrass) — higher citral yield, primary source of commercial lemongrass oil • Cymbopogon martinii (palmarosa) — rose-scented, used in perfumery
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