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Floriculture seedling nursery (coir-pith tray system)

The coir-pith tray nursery is the standard commercial system for raising marigold, chrysanthemum and other flower seedlings before transplant. Seed is sown into cellular plastic pro-trays filled with fermented coir pith (cocopeat) media, producing uniform, transport-ready seedlings within 20-25 days.

Principle

Direct seeding into open soil exposes flower seedlings to damping-off, irregular germination and competition from weeds. The pro-tray system isolates each seedling in its own cell with controlled medium, water and shade. Fermented coir pith offers low electrical conductivity, near-neutral pH, good water-holding capacity and a structure that suppresses pathogenic fungi when inoculated with antagonists. Uniform tray-grown seedlings transplant cleanly with intact root balls, allowing exact field spacing without thinning.

Implementation

ICAR-IIHR has standardised Arka Fermented Coco-Peat — solid-state fungal fermentation of raw coir pith completed in 30 days — as a sterile, low-EC growing medium. The medium is amended with Trichoderma and Pseudomonas bio-inoculants for damping-off suppression. Seed is sown one per cell, covered with vermiculite, kept under shade-net or low-tunnel and irrigated by overhead mist or hand-watering. ICAR-CIWA documents pro-tray seedling production as a women-led enterprise opportunity, with seedlings ready for transplant in 20-25 days.

Adoption context

The tray nursery format is now standard across commercial floriculture clusters: marigold and chrysanthemum belts in Karnataka, Tamil Nadu and Andhra Pradesh; rose nurseries in Pune-Nashik; gerbera, carnation and lily for protected cultivation. Pro-tray seedling supply is increasingly run as a specialised business serving multiple flower growers, often by SHGs and small-scale entrepreneurs.

Limitations

Cocopeat quality varies widely; un-aged or saline material can stunt seedlings. Tray reuse without sterilisation transmits disease across batches. Transplant shock occurs if seedlings are held in trays beyond optimal age. The system depends on overhead misting infrastructure that small operators may struggle to maintain reliably.

See also Festival Flower Market Cycle, Mulching Drip Floriculture, Photoperiod Night Lighting Chrysanthemum and Container Rooftop Farming.

References

  1. Arka Fermented Coco-Peat Production Technology. ICAR-Indian Institute of Horticultural Research.
  2. Pro tray seedling production technology. ICAR-Central Institute for Women in Agriculture.