🌹 Rose, Marigold & Chrysanthemum
Commercial Flower Crops
India's floriculture sector contributes about 0.6% of global flower production. Despite this seemingly small share, India is the world's largest producer of loose flowers, with Tamil Nadu leading in overall production. For cut flower production, Karnataka holds the top position. Floriculture is rapidly growing as an industry due to increasing demand for flowers in religious ceremonies, decorations, perfumery, and export markets.
Key Institutions
| Institute | Full Name | Location |
|---|---|---|
| DFR | Directorate of Floriculture Research | Pune (MH); shifted from New Delhi in 2014 |
| IIHR | Indian Institute of Horticultural Research | Bengaluru (KN) |
| NBRI | National Botanical Research Institute | Lucknow (UP) |
NOTE
The DFR is the apex body for floriculture research in India. It was originally established in New Delhi but relocated to Pune in 2014 to be closer to major flower-producing regions.
Important Facts:
- India's national flower: Lotus (Nelumbo nucifera) -- chosen for its cultural and spiritual significance across Indian traditions
- Rajasthan's state flower: Rohida (Tecomella undulata) -- a desert tree known for its bright orange flowers
- World's largest flower production: Netherlands and Holland -- the Netherlands dominates global cut flower trade through its advanced greenhouse technology and auction systems
- India's largest cut flower area: Karnataka -- primarily around Bengaluru and surrounding districts
- Loose flower capital: India (world's largest producer) -- loose flowers are used extensively in garlands, religious offerings, and decorations
- Cut flower excellence centre: Savai Madhopur (Rajasthan)
- Leading state for flower growing in India: Ajmer (Rajasthan) for flower production area
Flower Names and Titles
These titles are frequently asked in competitive exams. Each flower has earned its nickname based on its distinctive characteristics or cultural significance.
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Commercial Flower Crops
India's floriculture sector contributes about 0.6% of global flower production. Despite this seemingly small share, India is the world's largest producer of loose flowers, with Tamil Nadu leading in overall production. For cut flower production, Karnataka holds the top position. Floriculture is rapidly growing as an industry due to increasing demand for flowers in religious ceremonies, decorations, perfumery, and export markets.
Key Institutions
| Institute | Full Name | Location |
|---|---|---|
| DFR | Directorate of Floriculture Research | Pune (MH); shifted from New Delhi in 2014 |
| IIHR | Indian Institute of Horticultural Research | Bengaluru (KN) |
| NBRI | National Botanical Research Institute | Lucknow (UP) |
NOTE
The DFR is the apex body for floriculture research in India. It was originally established in New Delhi but relocated to Pune in 2014 to be closer to major flower-producing regions.
Important Facts:
- India's national flower: Lotus (Nelumbo nucifera) -- chosen for its cultural and spiritual significance across Indian traditions
- Rajasthan's state flower: Rohida (Tecomella undulata) -- a desert tree known for its bright orange flowers
- World's largest flower production: Netherlands and Holland -- the Netherlands dominates global cut flower trade through its advanced greenhouse technology and auction systems
- India's largest cut flower area: Karnataka -- primarily around Bengaluru and surrounding districts
- Loose flower capital: India (world's largest producer) -- loose flowers are used extensively in garlands, religious offerings, and decorations
- Cut flower excellence centre: Savai Madhopur (Rajasthan)
- Leading state for flower growing in India: Ajmer (Rajasthan) for flower production area
Flower Names and Titles
These titles are frequently asked in competitive exams. Each flower has earned its nickname based on its distinctive characteristics or cultural significance.
| Common Name | Title / Other Name |
|---|---|
| Dahlia | King of Flowers (Pushp Raj) -- named for its stunning variety of colours and forms |
| Rose | Queen of Flowers; symbol of love and beauty -- universally recognized across cultures |
| Gladiolus | Queen of Bulbous Plants; Sword Lily; Corn Flag -- named "sword lily" because its leaves resemble a sword (Latin gladius) |
| African Marigold | Rose of Indies -- so called because early European explorers mistakenly thought it originated in the Indies |
| Carnation | Female's Love -- traditionally associated with expressions of love and admiration |
| Chrysanthemum | Queen of East; Glory of East -- originated in China and holds deep significance in East Asian cultures |
| Tuberose | Rajnigandha; night-scented -- emits its strongest fragrance after sunset |
| Jasmine | Chameli / Mogra -- one of the most beloved flowers in Indian culture for garlands and perfumery |
1. Rose (Rosa spp.)
Rose (Rosa spp.) -- Queen of Flowers -- Source: Wikimedia Commons (CC)
- Botanical Name: Rosa spp. (primarily R. indica, R. damascena)
- Family: Rosaceae
- Chromosome number: 2n = 14
- Origin: India (considered centre of origin)
- Fruit type: Hip (the black fruit of rose is a rich source of Vitamin C)
- Other names: Symbol of love, beauty, and affection
IMPORTANT
The rose is arguably the most commercially important flower worldwide. It is used for cut flowers, loose flowers, essential oil extraction, rose water, and gulkand. India is considered a centre of origin for several Rosa species.
General Information
- India has the world's largest Big Rose Garden -- Dr. Zakir Hussain Rose Garden, Chandigarh, which houses over 1600 rose species
- International Rose Registration Authority -- USA (responsible for naming and registering new rose cultivars globally)
- National Rose Registration Society -- New Delhi
- DFR (Directorate of Floriculture Research) -- Savai Madhopur (Rajasthan)
- Rose colour: Red -- due to Pelargonidin, an anthocyanin pigment that gives the characteristic red hue
- Blue/Violet rose: Delphinidin pigment -- naturally absent in roses; blue roses are created through genetic engineering
- Rose attar (essential oil) is the most expensive perfume oil in the world, valued for its complex fragrance
- Anthocyanin provides rose colour -- the specific type of anthocyanin determines the exact shade (red, pink, or purple)
Rose Products
| Product | Details |
|---|---|
| Rose attar (Gulab attar) | Essential oil from petals (1:1 ratio with sandalwood); Citronellol & Geraniol are main chemical components |
| Rose oil | From petals; 0.01-0.05% extraction rate; Rosa damascena yields the most oil (0.05%) |
| Rose water (Gulab jal) | By-product of distillation; used in cooking, cosmetics, and religious ceremonies |
| Rose petal preserve (Gulkand) | Petals + sugar; a traditional Ayurvedic preparation that cools the body |
| Oil varieties | Nur Jahan, Himroj, Jwala, Rani Sahiba |
| Oil extraction | 4000 kg petals needed for 1 kg oil -- this enormous ratio explains the high cost of rose oil |
Why is rose attar so expensive?
Rose attar requires an extraordinary quantity of petals for extraction. Approximately **4000 kg of fresh petals** yield just **1 kg of rose oil**. The extraction rate is only 0.01-0.05%. Additionally, *Rosa damascena* (Damask rose), which gives the finest attar, blooms only for a short season and must be hand-picked at dawn when the oil content is highest. The oil is then co-distilled with sandalwood oil in a traditional method called *deg-bhapka* distillation, which further adds to its cost.Rose Rootstocks
Different rootstocks are chosen based on the climate and soil conditions of the growing region. The rootstock provides the root system while the desired variety is budded onto it.
| Rootstock | Usage |
|---|---|
| Rosa indica var. Odorata | North India -- well-adapted to the subtropical climate of northern plains |
| Rosa multiflora | South & West India -- vigorous growth suited to tropical conditions |
| Rosa bourboniana | Thorn-free -- selected when thornlessness is desirable |
| Rosa chinensis | Used in specific regions |
| Rosa centifolia | Used in specific regions |
Soil and Climate
- Soil pH: 6.0-7.5 (Desi rose: 7.0-9.0 -- desi varieties tolerate more alkaline soils)
- Climate: Warm (Ushan Jalvayu) -- roses need plenty of sunlight and moderate temperatures
- Production areas: Ajmer (Pushkar) -- largest rose-growing area in India; Khamor -- a major Damask rose area
- Rajsamand -- Khamnor & Haldighati -- famous for Damask rose (Rosa damascena) cultivation, which is the primary variety for attar production
Propagation
- Commercial propagation is mainly by T-budding (T-Kalikayan) -- this technique involves inserting a bud from the desired variety into a T-shaped cut on the rootstock bark. It is preferred because it gives a high success rate and produces plants true to the parent variety.
- Hard wood cuttings (December month) -- used for desi/country rose varieties; simpler but slower than budding
- Layering and grafting also used in specific situations
Classification of Rose Groups
TIP
For CUET, remember the Hybrid Tea group as the most important for cut flowers, and Floribunda for garden/landscape use. Know the first varieties in each group -- La France (first HT) and Rodhatt (first Floribunda).
| S.No. | Group | Features |
|---|---|---|
| 1 | T Rose (Tea Rose) | Originated from Chinese tea-scented roses; named for their tea-like fragrance |
| 2 | Hybrid Tea (HT) | Most important for cut flowers; single large flower per stem; varieties -- La France (first HT by Guillot), Super Star, First Prize, Paradise, Pusa Garima, Pusa Gaurav, Tushar, Arjun, Sinduri, Happiness, Confidence, Careless Love, Kiss of Fire, Blue Moon, Madahosh, Gladiator, Ratangandha |
| 3 | Floribunda | Large flower clusters; Hybrid -- T x Polyantha; Rodhatt (first by Poulsen); varieties -- Red Gold, Vivan Eliazabeth, Pusa Pitambar, Banjaran, Pusa Barahmasi, Mohini, Lohbaniy, Morning Sun |
| 4 | Polyantha | Small flowers in clusters; prolific blooming; varieties -- Pink Showers, Priti, Anjani, Nartaki, Swati, Wander, Rashmi |
| 5 | Miniature | Dwarf/Baby rose; ideal for pots and edging; varieties -- Lolly Pop, Gold Star, Renbao, Natkhot, Mickey, Dark Charm, Summer Butter, Desert Charm |
| 6 | Climbing Rose (Lata gulab) | Tall growing with long canes; used on walls, pergolas, and trellises; varieties -- Shaw Garden, Marshal Neel, Dehli Pink Pearl, Lal Kila, Dahli White Flight, Pinch of Gold |
| 7 | Grandiflora | Hybrid T x Floribunda; combines large flower size with clustering habit; variety -- Buccanner |
| 8 | Rambler | Vigorous climbers with small flowers in large clusters; varieties -- American Pillar, Excelsa, Albertine |
| 9 | Bourbon Rose (Desi gulab) | Highly scented; derived from Jean Roze x Damask Rose cross; primarily grown for attar extraction |
Other Important Varieties
| Category | Varieties | Features |
|---|---|---|
| Pattalvali kisam | Dr. B.P. Pal | First variety by Indian breeder |
| Kaante rahit (Thornless) | Pusa Mohit, Pusa Suchitra, Greed Gala, Nishkant (IIHR) | Thornless varieties -- important for easy handling |
| White flower | Tushar, June Pride | - |
| Red flower | First Red, Greed Gala, Black Magic, Halidud | - |
| Blue flower | Sambar | - |
| Chocolate colour | Mohini | - |
| Dark tike | Mrignalini | On ticket mark |
| Desi gulab | Noor Jahan, Himroj, Jwala, Rani Sahiba | For oil/attar extraction |
| Dr. S.D. Mukherjee | First rose variety developed by Dr. B. of India | Historical importance |
Diseases and Pests
Understanding rose diseases is crucial for both cultivation and exams. Die back is the most common and economically damaging disease of roses.
| Problem | Causal Organism | Notes |
|---|---|---|
| Die back | Diplodia sp. (fungal) | Most common disease; branches dry from the tip downward; prune infected parts and apply Bordeaux paste |
| Powdery mildew (Churnilasita/Chhachya) | Sphaerotheca pannosa var. Rosae | Common in winter when humidity is high; white powdery coating on leaves; manage with Kerathane, Propiconazole |
| Rose Wilt | Viral (Aphid vector) | Transmitted by aphids; causes stunting and wilting |
| Red scale | Aonidiella aurantii | Insect pest; forms scale-like covering on stems |
| Red spider mite | Tetranychus spp. | Causes yellowing and stippling of leaves; thrives in hot, dry conditions |
Physiological Disorders
These are not caused by pathogens but by environmental or nutritional factors:
- Bent Neck -- Stem weakness below the flower head; caused by poor vascular development or water stress
- Limp Neck -- Inadequate water uptake after cutting; common in cut flower trade
- Blind Shoot -- No flower bud formation at the shoot tip; caused by low light, extreme temperatures, or nutrient deficiency
- Bull Head -- Malformed, flattened flower with an excessively broad receptacle; caused by thrip damage or hormonal imbalance
Harvesting and Yield
- Cut flower: Harvest at tight bud stage (petals just starting to unfurl) -- this ensures maximum vase life as the flower continues to open in the vase
- Loose flower: Fully open flowers are harvested for garlands and religious use
- Green house yield: 150-200 stems/m^2/year
- One plant can give flowers for 10-12 years with proper maintenance and annual pruning
Pruning
Pruning is one of the most critical operations in rose cultivation. It rejuvenates the plant, removes dead/diseased wood, and shapes the bush for optimal flowering.
- Timing: September to mid-October (mainly) -- this allows new growth to develop and flower by winter
- Desi rose: December to mid-January
- Important operations: Withering (giving cup/cone shape to the bush), Pinching (topping -- removing the growing tip to encourage branching), Bending (bending branches to break apical dominance), Disbudding (removing side buds to get one large terminal flower)
2. Marigold (Tagetes spp.)
Marigold (Tagetes spp.) -- Source: Wikimedia Commons (CC)
- Family: Asteraceae / Compositae
- Origin: Central America (Mexico)
- Inflorescence: Capitulum (Head) -- a composite flower head typical of the Asteraceae family, containing many small florets packed together
- Marigold was introduced in India through Portugal -- Portuguese traders brought it to India during the colonial era, and it quickly became popular for religious and decorative use
IMPORTANT
Marigold is the most popular loose flower in India, widely used in garlands, religious ceremonies, and decorations. It is also commercially valuable for lutein extraction and as a companion plant to repel nematodes.
Types of Marigold
The two main types differ significantly in their ploidy level, height, and flower characteristics:
| Type | Scientific Name | 2n | Features |
|---|---|---|---|
| African marigold | Tagetes erecta | 2n = 2x = 24 (Diploid) | Tall (60-90 cm); large globular flowers; yellow/orange; primarily for loose flowers and garlands |
| French marigold | Tagetes patula | 2n = 4x = 48 (Tetraploid) | Dwarf (20-40 cm); smaller bicoloured flowers (red/yellow); primarily for beds & borders in landscaping |
| Signet marigold | Tagetes tenuifolia | - | Very small; edible flowers; used in salads and garnishing |
TIP
A common exam trick: African marigold is the diploid (2n=24) and French marigold is the tetraploid (2n=48). Students often confuse the ploidy levels -- remember "African = 24" (A comes first, smaller number).
General Information
- Most popular loose flower in India -- used in nearly every Indian festival and ceremony
- Lutein (Xanthophyll) -- a natural colouring agent extracted from marigold petals; used for colouring food, cosmetics, and as a dietary supplement for eye health
- Tagetes Signata -- provides the maximum quantity of aromatic oil among marigold species
- Tagetes Minuta -- used for perfume and cosmetics manufacturing; aromatic oil is obtained from this species
- Carotenoids and xanthophylls give the yellow/orange colour -- these pigments are commercially extracted and sold as natural food colourants
- Used as companion plant -- marigold roots release thiophene compounds that repel nematodes (allelopathic effect). Farmers inter-plant marigold with vegetables to protect against root-knot nematodes.
- Pinching -- done 40 days after transplanting to promote branching and increase the number of flowers per plant
- Protandry -- Marigold shows protandry (male flowers mature before female flowers), which promotes cross-pollination
Propagation
- Seeds -- direct sowing or transplanting through nursery; the primary method since marigold is an annual crop
- Annual plants -- seed propagation only (no vegetative propagation for annual types)
- Perennial types -- by cuttings also (some wild species)
Season
Marigold can be grown in all three seasons in India, making it a year-round commercial crop:
| Season | Sowing Time |
|---|---|
| Kharif | June-July |
| Rabi | October-November |
| Summer | February-March |
Important Varieties
African Marigold:
| S.No. | Variety | Features |
|---|---|---|
| 1 | Pusa Narangi Gainda | Orange; Cracker Jack x Golden Yellow x Pusa Basanti; large flowers; developed by IARI |
| 2 | Pusa Basanti Gainda | Yellow/cream flowers; popular for garlands |
| 3 | Arka Agni | Developed by IIHR Bengaluru |
| 4 | Arka Bangara | Developed by IIHR Bengaluru |
| 5 | Giant Double African | Large double flowers |
| 6 | Climax, Glimax | F1 hybrid; Triploid varieties (USA) -- triploid hybrids are seedless and have longer flowering |
| 7 | Nugget | Compact type |
French Marigold:
| S.No. | Variety | Features |
|---|---|---|
| 1 | Red Brocade | Bicoloured |
| 2 | Sofia | - |
| 3 | Water Skoch | - |
| 4 | Gold | - |
| 5 | Red Velonicea | - |
| 6 | Lemon Drop | Yellow |
| 7 | Queen Sophia | Popular variety |
| 8 | Honey Comb | - |
| 9 | Golden Bonzy | - |
Diseases
- Bacterial leaf spot -- caused by Pseudomonas cineraea; appears as water-soaked spots on leaves that later turn brown
Harvesting
- Flowers harvested 60-75 days after planting
- Harvested at full bloom stage -- unlike many cut flowers, marigold loose flowers are picked when fully open for maximum colour and weight
3. Chrysanthemum (Chrysanthemum x morifolium / Dendranthema grandiflorum)
Chrysanthemum -- Queen of East -- Source: Wikimedia Commons (CC)
- Botanical Name: Chrysanthemum x morifolium (syn. Dendranthema grandiflora)
- Family: Asteraceae / Compositae
- Chromosome number: 2n = 2x = 18; 4x = 36
- Origin: China -- cultivated there for over 2500 years
- Inflorescence: Capitulum / Head
- Other names: Queen of East / Glory of East; Sharad Ritu ki Rani (Queen of Autumn); Japan's National Flower; Autumn Queen
NOTE
Chrysanthemum is Japan's national flower and appears on the Imperial Seal of Japan. It was originally domesticated in China and later brought to Japan where it gained immense cultural significance. The "Festival of Happiness" in Japan celebrates chrysanthemum.
General Information
- Short Day Plant (SDP) -- requires short days (<14 hours of daylight) for flowering. This is why chrysanthemums naturally bloom in autumn-winter when days become shorter.
- Pyrethrum (Chrysanthemum cinerarifolium) -- a related species used for making pyrethrin insecticide, a natural botanical pesticide
- Flowering season: November-January (winter) -- coincides with short day length in India
- Propagation: Terminal cuttings (suckers/Ant bhustari) -- primary method for commercial cultivation
- Annual plants -- through seeds
- Perennial varieties -- through suckers/underground stolons
Photoperiod manipulation in chrysanthemum
Commercial growers can control chrysanthemum flowering by manipulating day length. To **delay flowering** (for out-of-season production), growers use **night-break lighting** -- briefly turning on lights during the middle of the night tricks the plant into perceiving long days. To **advance flowering**, growers cover plants with **black cloth** in the evening to artificially shorten the day. This photoperiodic control allows year-round production of chrysanthemums.Propagation Details
- Suckers -- the primary commercial method; suckers are underground shoots that emerge from the base of the plant
- Softwood cuttings (10 cm length) -- prepared in June (rainy season) with IBA 2000 PPM to promote root formation
- Planted 3-4 weeks after initial rooting
- Important operation: Pinching -- remove top shoot to promote side branching; done 4 weeks after planting, then repeated after 7 weeks
Important Varieties
| S.No. | Variety | S.No. | Variety |
|---|---|---|---|
| 1 | Birbal Sahni | 8 | Pusa Saarang |
| 2 | Mahatma Gandhi | 9 | Basantika |
| 3 | Kasturba Gandhi | 10 | Meera |
| 4 | Indira | 11 | Red Gold |
| 5 | Sonar Bangla | 12 | Sharad |
| 6 | Pusa Anmol -- photoperiod insensitive | 13 | Nilima -- for cut flower (blue/purple) |
| 7 | Arun Kumar | 14 | Pusa Gulwasta |
| - | Sharad Kumar | - | Yellostoni |
| - | Hemant Singar | - | Remniyo |
TIP
Remember Pusa Anmol -- it is photoperiod insensitive, meaning it can flower regardless of day length. This makes it valuable for year-round production without artificial light manipulation.
Important Cultural Practices
- Pinching -- Removing the top/apical portion to break apical dominance and promote branching. This increases the total number of flowers per plant but reduces the size of individual flowers.
- Done 4 weeks after planting, repeat at 7 weeks
- Disbudding -- Removing lateral flower buds to direct all the plant's energy into one large terminal flower (for exhibition/cut flowers).
- Done in October month; removal of lateral buds (axillary buds)
NOTE
Pinching and disbudding have opposite effects: Pinching = more flowers but smaller. Disbudding = fewer flowers but larger. Choose based on end use -- pinching for loose flowers, disbudding for cut/exhibition flowers.
Diseases
| Disease | Causal Organism |
|---|---|
| Wilt (Ukhta) | Fusarium oxysporum f.sp. gladioli (same pathogen affects gladiolus too) |
| Leaf spot | Septoria sp. |
Physiological Disorders
- Topple -- Caused by Ca (Calcium) deficiency; the stem becomes weak and the plant falls over
- Bud Rot -- Also caused by Ca deficiency; flower buds decay before opening
- Blindness -- Caused by inadequate temperature; the plant fails to initiate flower buds
- Negative Geotropism -- Due to uneven auxin distribution; stems grow in abnormal directions
Vase Life Extension
Cut flowers need preservative solutions to extend their display life. The sucrose provides energy, while HQC (8-Hydroxy Quinoline Citrate) acts as a germicide preventing bacterial blockage of stems.
| Flower | Sucrose + HQC Solution |
|---|---|
| Chrysanthemum | 1.5% + 200 PPM HQC |
| Gladiolus | 2.0% + 200 PPM HQC |
| Rose | 2-5% + 200 PPM HQC |
Image Generation Prompts
Image Generation Prompt 1: Rose Flower Anatomy
Detailed botanical cross-section illustration of a rose flower (Rosa spp.) showing all reproductive and structural parts. The flower is shown in longitudinal section through the center. Labeled parts: outermost sepals (green, 5), petals (multiple whorls in pink/red, showing the many-petaled nature of cultivated roses), stamens (numerous, arranged around the rim of the hypanthium with filaments and anthers), pistils (multiple carpels enclosed within the cup-shaped receptacle/hypanthium), ovary at the base of each pistil, style, and stigma. The receptacle (hip) is clearly shown as the hollow flask-shaped structure enclosing the carpels. An inset at bottom-right shows a mature rose hip (fruit) in cross-section with seeds (achenes) visible inside. Left side: an intact rose bud shown from the exterior with labeled sepals and peduncle (stem). Color scheme: deep pink petals, green sepals and stem, yellow stamens, white/cream interior structures. White background, precise botanical illustration style with thin black leader lines for labels, watercolor-style fills.
Image Generation Prompt 2: Chrysanthemum Flower Types
Educational reference chart showing five major chrysanthemum flower classification types arranged in a grid. Each type shown as a detailed top-view and side-view illustration: (1) Large Decorative -- large, fully double flower with broad, flat, loosely arranged ray florets curving inward; (2) Pompon -- small, perfectly globular, tightly packed flower head; (3) Anemone -- flat outer ring of ray florets surrounding a raised cushion-like central disc of tubular florets; (4) Spider -- long, thin, tubular ray florets that twist and curl outward like spider legs; (5) Single/Daisy -- one or two rows of flat ray florets around a prominent yellow central disc. Each type labeled with name and brief description. Center: a labeled cross-section of a composite flower head (capitulum) showing ray florets on the outside, disc florets in the center, the receptacle base, and involucral bracts (phyllaries). Colors: varied -- white, yellow, purple, bronze chrysanthemums to show diversity. White background, clean botanical illustration style.
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| India floriculture rank | World's largest loose flower producer; 2nd in total flower production; Tamil Nadu leads in loose flowers; Karnataka leads in cut flowers |
| DFR | Directorate of Floriculture Research — Pune (MH); shifted from Delhi in 2014 |
| Rose — family & basics | Rosaceae; Origin: India; 2n = 14; fruit = Hip (rich in Vitamin C); "Queen of Flowers" |
| Rose — colour pigments | Red = Pelargonidin (anthocyanin); Blue = Delphinidin (absent naturally in roses) |
| Rose — propagation | T-budding (most common); rootstock: R. indica (North India), R. multiflora (South/West India) |
| Rose — Hybrid Tea | Most important for cut flowers; La France = first HT variety (by Guillot); single large flower per stem |
| Rose — Floribunda | Flower clusters; Rodhatt = first variety (by Poulsen); HT × Polyantha cross |
| Rose — oil extraction | 4000 kg petals → 1 kg oil; 0.01-0.05% extraction rate; R. damascena best; Citronellol + Geraniol |
| Rose — diseases | Die back (Diplodia) = most common; Powdery mildew (Sphaerotheca pannosa) |
| Rose — pruning | September to mid-October; greenhouse yield: 150-200 stems/m²/year |
| Marigold — family & basics | Asteraceae; Origin: Mexico; inflorescence = Capitulum; introduced to India via Portugal |
| Marigold — types | African (T. erecta): tall, diploid 2n=24 French (T. patula): dwarf, tetraploid 2n=48 |
| Marigold — uses | Most popular loose flower in India; Lutein (Xanthophyll) extraction; nematode repellent (thiophene compounds) |
| Marigold — pinching | Done 40 days after transplanting; promotes branching and more flowers |
| Marigold — harvest | 60-75 days after planting; at full bloom stage |
| Chrysanthemum — family & basics | Asteraceae; Origin: China; 2n = 18; "Queen of East"; Japan's National Flower |
| Chrysanthemum — photoperiod | Short Day Plant (SDP) — flowers when day length < 14 hours; Pusa Anmol = photoperiod insensitive |
| Chrysanthemum — propagation | Terminal cuttings / suckers; softwood cuttings with IBA 2000 PPM |
| Chrysanthemum — operations | Pinching (4 + 7 weeks) → more but smaller flowers Disbudding (October) → fewer but larger flowers |
| Chrysanthemum — disorders | Topple & Bud Rot = Ca deficiency; Blindness = inadequate temperature |
| Chrysanthemum — vase life | 1.5% sucrose + 200 PPM HQC solution |
Image Generation Prompt 3: Marigold Varieties Comparison -- African vs French
Side-by-side educational comparison illustration of African Marigold (Tagetes erecta) and French Marigold (Tagetes patula). Left panel -- African Marigold: tall plant (60-90 cm height marker shown), single large globular double flower head (8-10 cm diameter), in bright orange-yellow, with pinnately divided leaves on sturdy upright stems. Inset: single flower head magnified showing tightly packed ray florets. Data box below: "Diploid (2n=24), tall, large flowers, used for loose flowers and lutein extraction." Right panel -- French Marigold: compact dwarf plant (20-40 cm height marker), multiple smaller flower heads (3-5 cm), showing characteristic bicolored petals (red/maroon center with yellow edges), bushier growth habit. Inset: magnified bicolored flower head. Data box below: "Tetraploid (2n=48), dwarf, bicolored, used for beds and borders." Center divider shows a shared capitulum cross-section (Asteraceae family) with ray and disc florets labeled. White background, vivid orange/yellow/red flowers, green foliage, clean educational illustration style with height scale bars.
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