🌸 Gladiolus, Tuberose & Jasmine
Gladiolus, Tuberose & Jasmine
4. Gladiolus (Gladiolus spp.)
Gladiolus -- Queen of Bulbous Plants -- Source: Wikimedia Commons (CC)
- Botanical Name: Gladiolus spp. (from Latin Gladius = Sword)
- Family: Iridaceae
- Chromosome number: 2n = 30 (Europe: 2n = 2x = 30; Asia: 2n = 4x = 60)
- Origin: South Africa
- Other names: Sword Lily, Queen of Bulbous Plants, Corn Flag -- the name "gladiolus" comes from the Latin word gladius meaning sword, referring to its sword-shaped leaves
- Main use: Cut flowers -- gladiolus is one of the most important cut flowers globally due to its tall, elegant spikes with multiple florets
IMPORTANT
Gladiolus is an important indicator plant for fluoride pollution. If fluoride levels in the air are elevated, gladiolus leaves show characteristic tip and margin burn, making it a natural biomonitor for air quality assessment near industrial areas.
General Information
- Gladiolus derives from Latin word Gladius meaning sword -- the sword-like foliage is the most distinctive feature of this plant
- Important indicator plant for fluoride pollution -- used as a bioindicator near brick kilns and aluminium smelters
- Main propagation material: Corms and cormels -- a corm is a solid, swollen underground stem (different from a bulb which has layers/scales)
- Ethylene hydrazine chloride is used to break corm dormancy -- freshly harvested corms have a dormancy period that must be broken before replanting
Climate and Soil
- Temperature: 16-30°C -- optimal for growth and flowering
- Soil pH: 5.5-6.5 -- slightly acidic to neutral soils are preferred
- Requires full sunlight -- gladiolus does not tolerate shade
- Sensitive to frost -- freezing temperatures damage both foliage and corms
Propagation
- Corms -- main propagation material (seed-size: 1.5 lakh corms/hectare)
- Spacing: 30 cm x 20 cm (R x P) -- rows are 30 cm apart, plants 20 cm apart within the row
- Planting depth: 5-7 cm
- Sowing season: September-October (plains); March (hills) -- timing ensures flowering during the cool season
- Corm storage: -3 to 4.5°C; one corm can be used 4-5 times before it is exhausted
- Spike length: 50-100 cm with 15-20 florets per spike -- the spike is the marketable product
Understanding corms vs bulbs
A **corm** (like gladiolus) is a solid, swollen stem base that stores food in the stem tissue itself. It has a thin papery covering called a **tunic** and buds (eyes) on its surface. A **bulb** (like onion or tuberose) consists of modified leaves (scales) arranged in layers around a central stem. After flowering, the old corm shrivels and a new corm forms on top of it, along with small **cormels** (baby corms) at the base. These cormels can be grown for 2-3 seasons to reach flowering size.Important Varieties
| S.No. | Variety | Colour/Features |
|---|---|---|
| 1 | Friendship | White |
| 2 | Happy End | Pink |
| 3 | Peter Pears | Salmon/Orange |
| 4 | Agni Rekha | Red |
| 5 | Dhiraj | Yellow; resistant to Fusarium wilt |
| 6 | Najrana | Pink |
| 7 | Suchitra, Shobha, Kumkum | IIHR varieties (developed at Bengaluru) |
| 8 | Pusa Saarang | - |
| 9 | Jester Gold | - |
| 10 | Her Majesty | Pink |
| 11 | Pusa Red Valentine | Red |
| 12 | Punjab Flame | Orange |
| 13 | Punjab Ghawan | - |
| 14 | Chrysanthemum Keerti | - |
Corm Management
Proper corm management is essential for successful gladiolus cultivation. The cycle involves planting, harvesting the new corm after flowering, curing, and storing until the next season.
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Gladiolus, Tuberose & Jasmine
4. Gladiolus (Gladiolus spp.)
Gladiolus -- Queen of Bulbous Plants -- Source: Wikimedia Commons (CC)
- Botanical Name: Gladiolus spp. (from Latin Gladius = Sword)
- Family: Iridaceae
- Chromosome number: 2n = 30 (Europe: 2n = 2x = 30; Asia: 2n = 4x = 60)
- Origin: South Africa
- Other names: Sword Lily, Queen of Bulbous Plants, Corn Flag -- the name "gladiolus" comes from the Latin word gladius meaning sword, referring to its sword-shaped leaves
- Main use: Cut flowers -- gladiolus is one of the most important cut flowers globally due to its tall, elegant spikes with multiple florets
IMPORTANT
Gladiolus is an important indicator plant for fluoride pollution. If fluoride levels in the air are elevated, gladiolus leaves show characteristic tip and margin burn, making it a natural biomonitor for air quality assessment near industrial areas.
General Information
- Gladiolus derives from Latin word Gladius meaning sword -- the sword-like foliage is the most distinctive feature of this plant
- Important indicator plant for fluoride pollution -- used as a bioindicator near brick kilns and aluminium smelters
- Main propagation material: Corms and cormels -- a corm is a solid, swollen underground stem (different from a bulb which has layers/scales)
- Ethylene hydrazine chloride is used to break corm dormancy -- freshly harvested corms have a dormancy period that must be broken before replanting
Climate and Soil
- Temperature: 16-30°C -- optimal for growth and flowering
- Soil pH: 5.5-6.5 -- slightly acidic to neutral soils are preferred
- Requires full sunlight -- gladiolus does not tolerate shade
- Sensitive to frost -- freezing temperatures damage both foliage and corms
Propagation
- Corms -- main propagation material (seed-size: 1.5 lakh corms/hectare)
- Spacing: 30 cm x 20 cm (R x P) -- rows are 30 cm apart, plants 20 cm apart within the row
- Planting depth: 5-7 cm
- Sowing season: September-October (plains); March (hills) -- timing ensures flowering during the cool season
- Corm storage: -3 to 4.5°C; one corm can be used 4-5 times before it is exhausted
- Spike length: 50-100 cm with 15-20 florets per spike -- the spike is the marketable product
Understanding corms vs bulbs
A **corm** (like gladiolus) is a solid, swollen stem base that stores food in the stem tissue itself. It has a thin papery covering called a **tunic** and buds (eyes) on its surface. A **bulb** (like onion or tuberose) consists of modified leaves (scales) arranged in layers around a central stem. After flowering, the old corm shrivels and a new corm forms on top of it, along with small **cormels** (baby corms) at the base. These cormels can be grown for 2-3 seasons to reach flowering size.Important Varieties
| S.No. | Variety | Colour/Features |
|---|---|---|
| 1 | Friendship | White |
| 2 | Happy End | Pink |
| 3 | Peter Pears | Salmon/Orange |
| 4 | Agni Rekha | Red |
| 5 | Dhiraj | Yellow; resistant to Fusarium wilt |
| 6 | Najrana | Pink |
| 7 | Suchitra, Shobha, Kumkum | IIHR varieties (developed at Bengaluru) |
| 8 | Pusa Saarang | - |
| 9 | Jester Gold | - |
| 10 | Her Majesty | Pink |
| 11 | Pusa Red Valentine | Red |
| 12 | Punjab Flame | Orange |
| 13 | Punjab Ghawan | - |
| 14 | Chrysanthemum Keerti | - |
Corm Management
Proper corm management is essential for successful gladiolus cultivation. The cycle involves planting, harvesting the new corm after flowering, curing, and storing until the next season.
- Curing: After harvest, corms are dried (cured) for 2-3 weeks at 27-30°C -- this heals wounds, hardens the tunic, and prepares corms for storage
- Storage: 4-7°C (cold storage) after curing -- low temperature prevents premature sprouting
- Dormancy: Corms have 2-3 months dormancy; broken by thiourea treatment or ethylene chlorohydrin -- without dormancy breaking, corms will not sprout uniformly
- Corm multiplication: From cormels (small daughter corms); 4-5 harvests possible from one corm before it degenerates
- Forcing: Corms can be treated with GA3 (gibberellic acid) to break dormancy for off-season production -- GA3 stimulates shoot elongation and early sprouting
Diseases
| Disease | Causal Organism | Notes |
|---|---|---|
| Wilt (Ukhta) | Fusarium oxysporum f.sp. gladioli | Most important disease; causes yellowing, wilting, and corm rot; resistant variety -- Dhiraj |
| Corm rot | Penicillium sp. | Storage disease -- occurs when corms are not properly cured or stored in damp conditions |
Physiological Disorders
- Topple -- Ca (Calcium) deficiency; the spike falls over because the stem lacks structural strength due to poor calcium uptake
- Bud Rot -- Ca deficiency; flower buds rot before opening
- Blindness -- Improper temperature; no spike emergence -- the plant produces only leaves without any flower spike
Spike Harvesting
- Harvest when 2-3 basal florets show colour (for cut flower trade) -- this is the optimal stage because the remaining buds will open sequentially in the vase, giving maximum display life
- Harvest in early morning or late evening -- when temperature is low and plants are fully turgid
- Leave at least 4 leaves on plant for corm development -- these leaves photosynthesize and provide food for the developing new corm underground
WARNING
Never remove all leaves when harvesting gladiolus spikes. Leaving at least 4 leaves is essential for the new corm to develop properly underground. Removing too many leaves results in small, weak corms that will not flower in the next season.
5. Tuberose (Polianthes tuberosa)
Tuberose (Polianthes tuberosa) -- Source: Wikimedia Commons (CC)
- Botanical Name: Polianthes tuberosa
- Family: Amaryllidaceae (previously Agavaceae) -- the family reclassification reflects modern molecular taxonomy
- Chromosome number: 2n = 2x = 30 (Diploid); also 2n = 60 (some cultivars are tetraploid)
- Origin: Mexico (Central America) -- like marigold, tuberose is a New World flower that became enormously popular in India
- Other names: Rajnigandha (Hindi) meaning "Night Queen"; Night-scented flower -- the fragrance intensifies dramatically after sunset
- Inflorescence: Spike
IMPORTANT
Tuberose is the most important flower for perfume extraction in India. Its concrete (a waxy aromatic extract obtained through solvent extraction) is highly valued in the international perfume industry. The flower's strongest fragrance occurs at night, earning it the name "Rajnigandha" (Night Queen).
General Information
- Tuberose is the most important flower for perfume extraction in India -- the concrete and absolute obtained from tuberose are used as base notes in premium perfumes
- Yields concrete through solvent extraction -- used in high-end perfumery worldwide
- Rajnigandha -- "Night Queen" because flowers emit their strongest fragrance at night due to increased volatile compound release in cooler temperatures
- Propagation: Bulbs (underground modified stem) -- tuberose bulbs are actually modified stems with fleshy scales
- Important for garlands, perfume, and religious offerings -- tuberose is a staple in Indian wedding garlands
- One of the most commercially important flowers of India
- Planting material: Bulbs (1-1.5 kg/hectare)
Types of Tuberose
The three types differ in petal arrangement and commercial use:
| Type | Features |
|---|---|
| Single | 1 row of petals; 6 petals per floret; used for essential oil/concrete extraction; stronger fragrance because the reproductive parts are exposed |
| Semi-double | 2-3 rows of petals; intermediate between single and double |
| Double | Multiple rows of petals; used for garlands and decorations; variety -- Pearl; visually more attractive but less fragrant |
TIP
For CUET: Remember that single-type tuberose is used for oil/concrete extraction (stronger fragrance), while double-type is used for garlands (more visually appealing). The variety Pearl is the most famous double type.
Propagation
- Through bulbs (offsets/cloves) -- mother bulbs produce several daughter bulbs (offsets) each season
- Bulb size: 1.5 cm diameter minimum for flowering -- smaller bulbs will produce only leaves, not flower spikes
- Season: April-May (plains); February-March (for winter flowering)
- Spacing: 30 x 30 cm (or 30 x 20 cm)
- Plant 3-5 cm deep -- planting too deep delays emergence, while too shallow causes lodging
Important Varieties
| S.No. | Variety | Type/Features |
|---|---|---|
| 1 | Rajat Rekha | Single; variegated leaves (silver-edged); used for edging/border purposes |
| 2 | Shringar | Single; specifically for concrete/oil extraction |
| 3 | Suvasini | Single |
| 4 | Prajwal | Single hybrid; IIHR variety; high yielding |
| 5 | Pearl (Double) | Most commercial double variety; widely grown for garlands |
| 6 | Calcutta Single | Commercial variety; strong fragrance |
| 7 | Calcutta Double | Double flowered |
| 8 | Mexican Single | From Mexico; original type |
| 9 | Arka Nirantara | Continuous flowering -- flowers throughout the year |
| 10 | Phule Rajni | Developed by MPKV Rahuri |
| 11 | Pusa Red Valentine | - |
Harvesting
- For loose flowers: When 2-3 basal florets open -- allows remaining buds to open during transport
- For concrete extraction: Fully open flowers picked in early morning -- maximum essential oil content at dawn
- Yield: About 8-10 t/ha loose flowers per year
Diseases
- Stem rot -- Sclerotium rolfsii -- a soil-borne fungal disease that causes rotting at the base of the plant; white cottony mycelium visible at soil level
- Bud necrosis virus -- causes browning and death of flower buds before they open
6. Jasmine (Jasminum spp.)
Jasmine (Jasminum sambac) -- Source: Wikimedia Commons (CC)
- Family: Oleaceae (the olive family -- jasmine is related to olives)
- Origin: India and Southeast Asia
- Highly fragrant flowers used for garlands, perfume (essential oil), and religious purposes -- jasmine is deeply embedded in Indian culture and is used daily in millions of homes
- National flower of Philippines: J. sambac
- Jasmine is the state flower of Rajasthan (Chameli)
Types of Jasmine
The three commercially important species have distinct characteristics and uses:
| Species | Common Name | Features |
|---|---|---|
| Jasminum sambac | Mogra / Arabian Jasmine | Double flowers; year-round flowering; most commercially important; Madurai region in Tamil Nadu is famous for mogra cultivation |
| Jasminum grandiflorum | Chameli / Spanish Jasmine / Jati | Star-shaped flowers; strong fragrance; main source of jasmine concrete/oil -- the international perfume industry primarily uses this species |
| Jasminum auriculatum | Juhi / Indian Jasmine | Small white flowers in clusters; used for garlands |
General Information
- Jasmine concrete -- obtained by solvent extraction using hexane or petroleum ether; the concrete is further processed into absolute for use in high-quality perfumery. Jasmine absolute is one of the most expensive natural perfumery ingredients.
- Jasmine is the most important loose flower after marigold in India
- Leading state: Tamil Nadu (especially Madurai) -- Madurai is known as the "Jasmine Capital" of India
- State flower of many regions -- Chameli (Rajasthan)
- Flowers are picked early morning before sunrise -- this is when the buds are about to open and the essential oil content is at its peak
Propagation
- Layering -- most common commercial method; a branch is bent to the ground and covered with soil, where it develops roots before being separated from the mother plant
- Cuttings -- hardwood cuttings (during monsoon); when humidity is high for better rooting
- Grafting -- for specific rootstock-scion combinations to combine desired traits
Important Varieties
J. sambac (Mogra):
- Motia, Madanban, Khoya, Gundumalli, Ramabanam, Belle of India
J. grandiflorum (Chameli):
- Pitchi, CO-1, CO-2 (Parimullai), Arka Surabhi
J. auriculatum (Juhi):
- CO-1, CO-2, Parimullai
Harvesting
- Flowers picked in early morning (before sunrise) -- timing is critical because flowers that open in sunlight lose volatile oils rapidly
- Mogra: Picked at bud stage (tight bud) for garlands -- buds open slowly after harvest, extending freshness
- Chameli: Picked when partially open for oil extraction -- partially open flowers have the highest concentration of essential oils
- Yield: 8-10 t/ha/year (Mogra); 5-6 t/ha (Chameli)
Cut Flower Preservation (Vase Life Extension)
Extending the vase life of cut flowers is crucial for the commercial cut flower industry. Proper post-harvest treatment can double or triple the display life of flowers.
Pulsing Solution
- Pulsing -- treating cut flowers briefly with a concentrated preservative solution immediately after harvest to increase vase life/shelf life. This is a short-duration treatment (minutes to hours) that loads the stem with preservatives.
- Solution composition: Sucrose (provides energy for the flower) + Germicide (8-HQC/8-Hydroxy Quinoline Citrate -- kills bacteria that block stems) + STS (Silver Thiosulphate -- blocks ethylene action) + Citric Acid (maintains pH 3-4 for better water uptake)
| Flower | Solution |
|---|---|
| Chrysanthemum | 1.5% sucrose + 200 PPM HQC |
| Gladiolus | 2.0% sucrose + 200 PPM HQC |
| Rose | 2-5% sucrose + 200 PPM HQC |
Anti-ethylene Compounds
Ethylene is a natural plant hormone that accelerates senescence (aging) and petal drop in cut flowers. These compounds counteract ethylene's effects:
| Compound | Function |
|---|---|
| STS (Silver Thiosulphate) | Anti-ethylene; extends vase life of carnations -- blocks ethylene receptor sites on cell membranes |
| 1-MCP (1-Methylcyclopropene) | Ethylene action inhibitor -- binds irreversibly to ethylene receptors, preventing ethylene from triggering senescence |
| AOA (Aminooxyacetic acid) | Ethylene synthesis inhibitor -- blocks the enzyme ACC synthase, preventing the plant from producing ethylene |
TIP
Remember the distinction: STS and 1-MCP block ethylene action (at the receptor level), while AOA blocks ethylene synthesis (stops the plant from making ethylene in the first place). Both approaches extend vase life, but they work by different mechanisms.
Comprehensive Flower Comparison Table
This table is an excellent quick-reference for revision. All six flowers differ in family, origin, propagation method, and primary use.
| Feature | Rose | Marigold | Chrysanthemum | Gladiolus | Tuberose | Jasmine |
|---|---|---|---|---|---|---|
| Family | Rosaceae | Asteraceae | Asteraceae | Iridaceae | Amaryllidaceae | Oleaceae |
| Origin | India | Mexico | China | S. Africa | Mexico | India/SE Asia |
| 2n | 14 | 24 (African), 48 (French) | 18, 36 | 30, 60 | 30, 60 | - |
| Propagation | T-budding | Seed | Suckers/Cuttings | Corms | Bulbs | Layering |
| Flower type | Cut & Loose | Loose | Cut & Loose | Cut | Loose & Perfume | Loose & Perfume |
| Main use | Cut flower, oil | Garlands, lutein | Exhibition, cut | Cut flower | Perfume, garlands | Garlands, concrete |
| Title | Queen of Flowers | Rose of Indies | Queen of East | Queen of Bulbs | Rajnigandha | Mogra |
CUET Important Points to Remember
- Rose -- Queen of Flowers; propagated by T-budding; Hybrid Tea for cut flowers; Pelargonidin gives red colour
- Marigold -- Most popular loose flower in India; African (tall, diploid 2n=24) vs French (dwarf, tetraploid 2n=48); lutein/xanthophyll extraction; nematode repellent
- Chrysanthemum -- Queen of the East; Short Day Plant (SDP); pinching and disbudding are critical operations; originated in China
- Gladiolus -- Queen of Bulbous Plants; propagated by corms; from South Africa; Sword Lily; harvest when 2-3 basal florets show colour
- Tuberose -- Rajnigandha; night-scented; used for perfume/concrete extraction; propagated by bulbs; from Mexico
- Jasmine -- Mogra (J. sambac) most commercial; concrete for perfumery; India is a leading producer; J. grandiflorum for oil
- STS (Silver Thiosulphate) -- anti-ethylene agent; extends vase life of carnations
- 1-MCP -- ethylene action inhibitor for cut flower preservation
- 8-HQC -- germicide used in flower holding solutions
- Lutein from marigold is used as natural food colouring agent
- DFR -- Directorate of Floriculture Research; Pune (MH)
- India ranks 1st in loose flower and 2nd in total flower production globally
Image Generation Prompts
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Gladiolus — family & basics | Iridaceae; Origin: South Africa; 2n = 30; "Queen of Bulbous Plants" / "Sword Lily" |
| Gladiolus — propagation | Corms and cormels; 1.5 lakh corms/ha; spacing 30 × 20 cm; planting Sept-Oct (plains) |
| Gladiolus — harvest | When 2-3 basal florets show colour; leave 4 leaves on plant for corm development |
| Gladiolus — fluoride | Important indicator plant for fluoride pollution — bioindicator near industrial areas |
| Gladiolus — diseases | Fusarium wilt (F. oxysporum f.sp. gladioli) = most important; resistant variety: Dhiraj |
| Gladiolus — disorders | Topple & Bud Rot = Ca deficiency; Blindness = improper temperature |
| Gladiolus — corm storage | Curing: 2-3 weeks at 27-30°C; storage: 4-7°C; dormancy: 2-3 months; broken by thiourea/ethylene chlorohydrin |
| Tuberose — family & basics | Amaryllidaceae; Origin: Mexico; 2n = 30; "Rajnigandha" (Night Queen) |
| Tuberose — importance | Most important flower for perfume extraction in India; yields concrete by solvent extraction |
| Tuberose — types | Single (1 row petals) → oil/concrete extraction Double (multiple rows) → garlands; variety Pearl = most commercial double |
| Tuberose — propagation | Bulbs (offsets); min 1.5 cm diameter for flowering; spacing 30 × 30 cm |
| Tuberose — key varieties | Rajat Rekha (variegated), Shringar (concrete), Prajwal (IIHR hybrid), Arka Nirantara (continuous flowering) |
| Tuberose — yield | 8-10 t/ha/year loose flowers |
| Jasmine — family & basics | Oleaceae; Origin: India/SE Asia; J. sambac = National flower of Philippines |
| Jasmine — species | Mogra (J. sambac) = most commercial Chameli (J. grandiflorum) = main source of jasmine oil/concrete Juhi (J. auriculatum) = garlands |
| Jasmine — propagation | Layering (most common); also cuttings and grafting |
| Jasmine — harvest | Early morning before sunrise; Mogra at bud stage; Chameli partially open; yield 8-10 t/ha (Mogra) |
| STS (Silver Thiosulphate) | Anti-ethylene; extends vase life of carnations — blocks ethylene receptors |
| 1-MCP | Ethylene action inhibitor — binds irreversibly to ethylene receptors |
| AOA | Ethylene synthesis inhibitor — blocks ACC synthase enzyme |
| 8-HQC | Germicide in flower holding solutions — prevents bacterial stem blockage |
Image Generation Prompt: Gladiolus Corm Structure and Growth Stages
Educational diagram showing the complete lifecycle of gladiolus through its corm. Top section: detailed cross-section of a mature gladiolus corm with labeled parts -- tunic (dry papery covering), corm tissue (solid starch-storing modified stem), basal plate (bottom with root scars), lateral buds (eyes), apical bud at the top, and small cormels (daughter corms) attached at the base. Middle section: four sequential growth stages shown left to right -- (1) planted corm with roots emerging from basal plate, (2) sprouting stage with shoot emerging and contractile roots pulling corm deeper, (3) full growth with leaves, flower spike, and a new corm forming on top of the old (shriveling) corm, (4) post-harvest showing the new large corm sitting on top of the exhausted old corm, with several cormels around the base. Bottom section: the harvested spike showing the correct cut stage -- 2-3 basal florets showing color while upper buds are still closed, with an arrow labeled "harvest at this stage." White background, green shoots, brown corm tissue, colorful florets (salmon/pink), educational textbook style with neat labels and arrows.
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