Henna (Mehndi)
Lawsonia inermis
📖 About this plant
Henna (Lawsonia inermis), known as mehndi in Hindi, marithondi in Tamil, and henna in Arabic/English, is a small evergreen shrub or small tree in the Lythraceae (loosestrife) family, prized for over 6,000 years for the red-orange dye (lawsone) found in its leaves — used for body art (mehndi), hair dye, fabric dye, and leather tanning. Native to North Africa, the Middle East, and South Asia, henna has been used since the Bronze Age — ancient Egyptians used it to dye the nails and hair of mummies (Ramses II’s mummy has henna-dyed hair), and it has been used in Indian, Pakistani, Arab, Jewish, and African wedding traditions for millennia. In Indian culture, mehndi is an essential part of weddings (the “mehndi ceremony” is one of the most joyous pre-wedding rituals), festivals (Karva Chauth, Diwali, Eid), and religious occasions — brides have intricate henna patterns applied to their hands and feet that can take 8-12 hours to apply. Beyond its cosmetic use, henna has a long history in Ayurvedic, Unani, and traditional medicine — for headaches, skin conditions (ringworm, athletes foot), burns, wounds, and as a cooling agent (in desert cultures, henna paste is applied to the palms and soles to cool the body). The plant is a small shrub or tree, 2-6 m tall, with small dark green elliptical leaves (the source of the dye), small intensely fragrant white-pink flowers used in perfumery, and small brown capsule fruits. The leaves are dried and ground into a fine powder, which is mixed with water, lemon juice, and essential oils into a paste that releases the lawsone dye — this dye binds permanently to keratin (the protein in skin, hair, and nails), staining it red-orange. The stain darkens over 48 hours and lasts 1-3 weeks on skin, longer on hair.
🧑🌾 Care requirements
Full sun
Drought-tolerant; deep watering when dry
Low to moderate (30-60%)
20-40°C
Well-draining sandy loam; pH 5.0-7.5
Balanced NPK in spring; phosphorus for leaf yield
🌐 Common Names
📋 Plant facts
- 🌍 Origin
- North Africa, Middle East, and South Asia
- 📏 Max height
- 2-6 m
- 📐 Spread
- 1-3 m
- 🕰️ Bloom time
- Spring; small fragrant white-pink flowers in clusters
- 🎨 Bloom color
- White to pale pink (fragrant)
- 🍃 Foliage color
- Small dark green elliptical leaves (release red dye when crushed)
- ⏳ Lifespan
- 15-30 years
- 📈 Growth rate
- Moderate — first leaf harvest in 1 year
- ☠️ Toxicity
- Non-toxic externally; rare contact allergy in sensitive individuals
- 🌱 Propagation
- Seeds, semi-hardwood cuttings
🛡️ Health & Safety
Non-toxic externally; rare contact allergy in sensitive individuals
Common issues
- Henna leaf spot
- powdery mildew
- sooty mold
- scale insects
- mealybugs
- aphids
- henna caterpillar (defoliator)
- root knot nematodes
- leaf yellowing from overwatering or nutrient deficiency
💡 Care tips
- Grow from seeds (preferred — germinate in 1-4 weeks after soaking overnight in warm water) or semi-hardwood cuttings (root in 4-8 weeks).
- Plant in full sun in well-draining, slightly acidic to neutral sandy loam.
- Henna thrives in hot, dry climates — ideal temperature 20-40°C, humidity 30-60%, and is extremely drought-tolerant once established.
- It does NOT do well in humid tropical regions (fungal diseases) or in cold climates (frost-sensitive).
- Water sparingly — henna is a desert-adapted plant and suffers from overwatering.
- Water young plants weekly
- established plants need water only during extended drought.
- Mulch lightly to conserve moisture.
- Feed with balanced NPK in spring
- supplement with phosphorus for leaf yield.
- Pinch growing tips of young plants to encourage bushy growth.
- The plant grows 1-2 m in the first year and reaches mature size in 3-4 years.
- For leaf harvest: prune plants heavily twice a year (after the monsoon and in spring) — cut branches back to 30-50 cm to force bushy regrowth.
- Dry harvested leaves in the shade (sun destroys the dye) for 7-14 days until brittle, then grind into a fine powder.
- Sift through a fine mesh to remove stems — the finer the powder, the better the dye release.
- Store henna powder in an airtight container in the freezer (heat and light degrade the dye) — properly stored, henna powder retains dyeing power for up to 1 year.
- To make mehndi paste: mix henna powder with lemon juice (or strong black tea) to a smooth paste, add 1-2 tsp sugar and 5-10 drops of essential oil (lavender, cajeput, or tea tree — these contain terpineol which enhances dye release), cover and let sit for 8-24 hours at room temperature for dye release, then apply through a cone.
- Scrape off dried paste after 4-8 hours (do not wash)
- avoid water for 12-24 hours — the stain will darken from orange to deep red-brown over 48 hours.