Gerbera: Cultivation and Care in Greenhouse Conditions

Gerbera (Gerbera jamesonii), commonly known as the Transvaal Daisy, is one of the world’s most popular cut flowers. Native to subtropical Southern Africa, it ranks among the top five cut flowers globally – right alongside roses, carnations, chrysanthemums, and tulips. Its bold, symmetrical blooms, long stems free of foliage, and an impressive range of colours make it a favourite for bouquets, floral arrangements, and event decorations. But growing gerberas commercially is not as simple as putting a seed in the ground. It demands precise environmental control, which is why greenhouse cultivation has become the standard for commercial production worldwide.

Why greenhouses are essential for gerbera 🔗

Gerberas are sensitive plants. They do not tolerate wide fluctuations in temperature, humidity, or moisture. Outdoor cultivation exposes them to unpredictable weather, pest pressure, and inconsistent light – all of which reduce flower quality and yield. A greenhouse solves these problems by giving the grower full control over the growing environment.

Under greenhouse conditions, growers can produce gerberas year-round, regardless of external weather. Commercial operations in the Netherlands, for instance, heat and light their greenhouses to simulate summer conditions throughout the year, enabling continuous production for two or more years from the same plants. In tropical countries like India, naturally ventilated polyhouses with shade nets are the preferred structure, protecting crops from excessive sunlight while maintaining airflow.

Ideal soil and growing media 🔗

Gerbera roots need excellent drainage and aeration. The ideal soil is well-drained, light, and neutral to slightly alkaline, with a pH between 5.5 and 7.0. Loam soil – a balanced mix of sand, silt, and clay – works well because it retains enough moisture without becoming waterlogged.

In many commercial setups, growers use raised beds filled with a growing media composed of farmyard manure, sand, and cocopeat or paddy husk in a 2:1:1 ratio. This ensures the porous, well-aerated root zone that gerberas demand. Red lateritic soil is considered particularly suitable in Indian conditions.

Soil-based vs. soilless cultivation 🔗

Many commercial growers now prefer soilless media such as cocopeat or peat-perlite mixes, often grown in pots or crates rather than ground beds. This approach avoids soil-borne pathogens like Phytophthora – a root rot organism that is the single biggest threat to in-ground gerbera crops. Pot-grown gerberas have been shown to produce 25-30% more flowers than those grown in soil, making the extra investment worthwhile. Pots can also be elevated off the ground, which improves drainage, protects leaves from soil contact, and makes harvesting easier.

Before planting in ground beds, soil fumigation is essential. A common method is drenching beds with 2% formaldehyde solution and covering them with plastic sheeting for two to three days. This step helps control Phytophthora, Fusarium, and Pythium before the crop is established.

Temperature and humidity requirements 🔗

Temperature management is at the heart of successful gerbera cultivation. The ideal daytime temperature ranges from 22°C to 25°C, while night temperatures should be maintained between 12°C and 16°C. These conditions closely replicate the flower’s native subtropical highland climate – warm days and cool nights.

Temperatures above 27°C cause heat stress, leading to poor flower quality, shorter stems, and increased disease susceptibility. At the other end, temperatures consistently below 10°C will stop flowering altogether, though the plants can survive brief exposure to mild frost.

Humidity needs careful balancing. The optimal relative humidity for gerberas falls between 50% and 70%. Too much humidity promotes fungal diseases like powdery mildew and Botrytis (grey mould), while too little causes water stress and poor transpiration. Modern greenhouse operations use a combination of heating, ventilation, and dehumidification systems to keep humidity within this range. Venting the greenhouse around sunset and heating at night are practical strategies to prevent moisture from building up overnight.

Light and photoperiod 🔗

Gerberas are facultative long-day plants, meaning they flower best when day lengths exceed 12-13 hours. In regions with short winter days, supplemental lighting helps maintain production. Commercial growers in Europe routinely use grow lights during autumn and winter to extend the photoperiod and keep plants flowering.

While gerberas need bright light, direct intense summer sun can scorch the foliage. In tropical climates, 50% shade nets are installed inside the polyhouse ceiling to filter excessive radiation during peak hours. The shade net is typically deployed from around 9:30 AM to 5 PM in summer and adjusted seasonally.

Propagation and planting 🔗

Gerberas are commercially propagated through two main methods: division of suckers and tissue culture. Tissue culture plants are preferred for large-scale commercial operations because they produce genetically uniform, disease-free stock. Well-developed tissue culture plants with 4-6 leaves are ideal for transplanting.

Plants are spaced at either 40 × 30 cm or 30 × 30 cm on raised beds. A critical point during planting is to never bury the crown – the central growing point of the plant – as this makes it vulnerable to rot. After planting, initial flower buds are typically removed for the first two months to allow the plant to build a strong root system and leaf canopy before being allowed to flower.

Irrigation and nutrition 🔗

Drip irrigation is the standard for commercial gerbera production. It delivers water directly to the root zone without wetting the foliage, which is critical for disease prevention. The average water requirement is about 500-700 ml per plant per day, applied through drippers once every two to three days.

Nutrition is supplied through fertigation – delivering dissolved fertilizers through the drip system. A typical schedule alternates between two nutrient tanks: one containing calcium nitrate, potassium nitrate, and iron on alternate days, and the other supplying mono ammonium phosphate, sulphate of potash, magnesium sulphate, and essential micronutrients like manganese, zinc, copper, boron, and molybdenum. Maintaining the growing media pH between 5.5 and 5.8 is important, as gerberas quickly show iron and manganese deficiencies when pH rises above 6.5.

After-cultivation care 🔗

Regular soil raking (once every 15 days) improves aeration around the roots. Old and infected leaves should be removed to maintain good sanitation and air circulation. Hand weeding is done as needed to prevent nutrient competition.

Commercial varieties and their selection 🔗

With over 300 varieties available globally, choosing the right cultivar is a key commercial decision. The selection depends on the target market, desired flower colour, bloom size, stem length, and vase life.

Types by flower size 🔗

Standard gerberas have the largest blooms (up to 12-13 cm across) and are the most recognisable in retail shops. They produce around 50 flowers per plant per year. Mini gerberas offer medium-sized flowers in a wider range of colours and shapes, producing roughly 75 stems per plant per year. Micro gerberas (such as the Picololini range) bear small, abundant flowers – skilled growers can harvest over 100 stems per plant annually.

Popular colour groups 🔗

Red, pink, yellow, and white remain the most widely demanded colours for both domestic and international markets. Orange, cream, bi-colour, and speciality shades command premium prices. In India, varieties like Ruby Red, Sangria (red), Doni, Supernova (yellow), Rosalin, Salvadore (rose), Pink Elegance, Marmara (pink), Carrera, Goliath (orange), and Farida, Winter Queen (cream) are commonly grown. TNAU has also released varieties YCD-1 and YCD-2 for commercial cultivation.

Pest and disease management 🔗

Gerberas are susceptible to several pests and diseases, and greenhouse conditions can sometimes intensify these problems if environmental controls are not maintained properly.

Major pests 🔗

The most common insect pests include whiteflies, aphids, thrips, and spider mites. Neem oil or insecticidal soap sprays are effective for controlling these pests. For heavier infestations, systemic insecticides like imidacloprid can be used. Thrips can be managed with fipronil, while abamectin or propargite is effective against red spider mites.

Major diseases 🔗

Powdery mildew is the most widespread fungal disease in greenhouse gerberas. It appears as white dusty patches on leaves, stems, and sometimes flower petals, and thrives at moderate temperatures (20-28°C) with high humidity. Prevention relies on good air circulation, proper plant spacing, and maintaining humidity below 70%. Wettable sulphur or azoxystrobin sprays are commonly used for chemical control.

Crown and root rot caused by Phytophthora cryptogea is the most destructive disease, especially in soil-based cultivation. Affected plants wilt suddenly and roots turn brown and soft. Soil fumigation before planting and avoiding waterlogging are the primary preventive measures. Botrytis blight (grey mould) is another concern, causing brown spots on petals and stems, particularly in cool, humid conditions. Keeping foliage dry and ensuring good ventilation helps prevent this disease.

Other diseases reported on gerberas include leaf spots caused by Alternaria, bacterial leaf spot (Pseudomonas cichorii), and root-knot nematode (Meloidogyne incognita).

Harvesting and post-harvest handling 🔗

Gerberas are ready for harvest when the outer two to three rows of disc florets (the tiny tubular flowers in the centre of the bloom) are perpendicular to the stalk. The flower stalk is cut about 2-3 cm above the base. Some growers prefer to pull the stalk off the plant rather than cutting it, which reduces the chance of transmitting pathogens through cutting tools.

Post-harvest handling is where gerberas are particularly demanding. Their hollow stems are highly susceptible to bacterial clogging, which blocks water uptake and causes the flower head to wilt. Immediately after harvest, stems should be placed in clean, chlorinated water. Soaking stalks in a sodium hypochlorite solution (5-7 ml per litre of water) for 4-5 hours significantly improves vase life. Using specialised gerbera tabs – essentially chlorine-based water sterilisers – is standard practice.

Properly handled, commercial gerberas can last 7 to 14 days in a vase, which makes them excellent value for consumers and a reliable product for florists.

Grading and yield 🔗

Flowers are graded into categories (A, B, C, D) based on stem length and flower diameter. For export markets, stem lengths of 40-60 cm are typically required, along with strict standards for colour intensity and bloom uniformity. Under greenhouse conditions, growers can expect a yield of 175-200 flowers per square metre per year, compared to 130-160 flowers in open-field conditions.

Market potential: domestic and export 🔗

Gerberas hold a strong position in both domestic and international flower markets. The global cut flower market continues to grow, and gerbera is one of the most traded species within it. In India, states like Maharashtra, Karnataka, Tamil Nadu, Gujarat, West Bengal, and Himachal Pradesh are major gerbera-producing regions. Export demand from India has been steadily increasing, with flowers shipped to markets in Europe, the Middle East, and Southeast Asia.

For export, quality standards are notably higher. Flowers must withstand longer transportation times while maintaining their appearance. This requires meticulous post-harvest handling, standardised packaging, and often cold-chain logistics. The wide colour palette – with every colour except blue represented – gives gerberas a versatile appeal across different cultural preferences and occasions.

For domestic markets, gerberas are widely used in weddings, festivals, corporate events, and daily worship. Their relatively lower price point compared to roses, combined with visual impact and decent vase life, makes them a consistent seller.

Economics of gerbera cultivation 🔗

Greenhouse gerbera cultivation requires significant upfront investment – the polyhouse structure, drip irrigation, shade nets, climate control equipment, and quality planting material all add up. However, the returns can be substantial. A well-managed gerbera crop starts producing from the third month after planting and continues for up to two years. With yields of approximately two stems per plant per month and market prices that hold strong for quality blooms, the payback period for a gerbera greenhouse project typically ranges from 2 to 3 years.

The controlled-environment approach also means fewer crop losses from weather events and pests, giving growers predictable production cycles and more reliable income streams compared to open-field floriculture.

What do you think? With rising demand for cut flowers in Indian domestic and export markets, could small-scale greenhouse gerbera farming become a viable livelihood option for young agricultural entrepreneurs? What role might newer technologies – like automated climate control and soilless cultivation – play in making gerbera production more accessible and profitable?

References

1. https://www.interesjournals.org/articles/diseases-of-gerbera-and-its-management-69009.html
2. https://drygair.com/blog/gerbera-greenhouse/
3. https://farmerbailey.com/pages/gerbera
4. https://agritech.tnau.ac.in/horticulture/horti_flower%20crops_gerbera.html
5. https://www.researchgate.net/publication/346784203_Cultivation_of_Gerbera_in_Polyhouse
6. https://www.floraldesigninstitute.com/blogs/resources-flower-library/gerbera
7. https://hgic.clemson.edu/factsheet/gerbera-daisy/
8. https://pnwhandbooks.org/plantdisease/host-disease/gerbera-daisy-powdery-mildew
9. https://www.marketsandmarkets.com/Market-Reports/cut-flowers-market-18187231.html