Seedling Propagation Greenhouse Project
A propagation greenhouse project designs the greenhouse structure that manages every stage from seed to dispatch in its own climate zone, sub-irrigation and capillary irrigation, fertigation, internal logistics and automation as one system. AGIMEX configures every propagation greenhouse specifically for the project, based on the production programme, the site's climate and the water source; within the agreed scope, it undertakes procurement, installation, commissioning and season-long support.
A strong harvest starts with uniform, healthy seedlings.
Plant biology first, then engineering
Seedlings are small, their root volume is limited and the production cycle is short; a small deviation in climate affects the whole batch. The goal of a propagation greenhouse is therefore uniformity: every plug cell receiving the same water, the same nutrients and the same climate. Design starts with the crops, annual seedling volume, batch durations and dispatch schedule.
A separate climate zone for each stage
Germination, rooting, healing of grafted seedlings, growing on and hardening off (acclimatisation to outdoor conditions) each require different temperature, humidity and light. These stages are designed as separate zones or controlled chambers; for germination and healing, multi-tier LED-lit climate chambers make better use of floor area and make seedling production largely independent of seasonal conditions and more predictable.
In the upper diagram, seedlings pass in turn through the sowing, germination chamber, rooting and graft healing, growing-on, hardening-off and dispatch zones; each zone has its own temperature, humidity and light settings. In the lower section, trays sit on a bench over a thin water film or a permeable mat; the growing medium draws water up from below, and excess solution is collected, disinfected and reused.
Production flow from seed to dispatch
- 1Sowing
- 2Germination chamber
- 3Rooting and graft healing
- 4Growing on
- 5Hardening off
- 6Dispatch
Irrigation: the same water to every cell, at the same time
- Capillary (sub-irrigation)Trays are placed on a permeable mat or a thin water film; the growing medium draws up from below exactly the water it needs. Moisture is equalised across the whole bench, foliage stays dry and disease risk is reduced. Research shows that closed sub-irrigation can markedly reduce water use and nutrient loss compared with overhead irrigation.
- Ebb & flow benches and floorsThe bench or concrete floor is briefly flooded with nutrient solution and then drained; the drain water is collected, disinfected and reused.
- Boom irrigationTravelling booms provide flexibility for overhead irrigation and crop protection, with programmes that change with seedling age; they can be combined with sub-irrigation.
- Mist propagationFor leafy cuttings and sapling rooting, intermittent misting combined with root-zone heating speeds up rooting.
The choice of system depends on the crop, tray type, water quality and labour targets. Where water is saline, sub-irrigation is designed together with water treatment.
Water: closed loop and biosecurity
Drain water is not waste but a disinfected resource. UV disinfection, filtration and precision fertigation (as an official Netafim dealer) are designed as a closed loop, conserving water and fertiliser while also reducing the risk of disease transmission.
Space and internal logistics: the plant comes to the worker
Rolling benches open up more production area under the same roof; container transport systems, automated sowing and transplanting lines, and traceability from batch to dispatch reduce labour and plant handling. The layout is planned together with the greenhouse frame's bay spacing and can grow phase by phase as capacity increases.
Reference study: Seedling Propagation and Sapling Rooting Greenhouses
As part of an investment project, AGIMEX prepared the engineering design and specifications for a 4,752 m² seedling propagation greenhouse (9 spans × 9.6 m × 55 m) and a 528 m² sapling rooting greenhouse on a separate site. The propagation greenhouse uses boom irrigation; the sapling rooting greenhouse uses a system combining subsurface drip lines running through the rooting medium with arrow drippers. These were designed together with the structure, climate control, fertigation, root-zone management, automation and production logistics.
View the project studyOur project path
- Feasibility and production programme: crops, annual seedling volume, batch durations, market.
- Design and engineering: climate zones, irrigation, water loop and logistics in one project.
- Procurement and manufacturing: systems are selected and manufactured to the design.
- Installation and commissioning: every zone and system is tested against its design values.
- Team training and first batches: on site, with your team.
- Ongoing support: an open path to post-installation monitoring, service and advisory options.
With you after installation
Installation is the start of the relationship. AGIMEX stays with the grower after commissioning, with every form of support that may be needed open to the client: remote monitoring, periodic site visits, service and maintenance agreements, and comparison of batch data against the design. When needed, AGIMEX also connects its clients with a network of specialists providing international greenhouse production consultancy.
Funding and market conditions
Many markets offer public support for greenhouse and pressurised-irrigation investments, such as grants, subsidised credit or cost reimbursement. Eligibility, support rates and application windows differ by country and change with each funding period. Only the terms published by the relevant national authorities and paying agencies are binding. This information is for guidance only, and AGIMEX accepts no liability for decisions made on the basis of it.
Frequently asked questions
- What is a seedling propagation greenhouse?
- A production greenhouse in which vegetable, fruit or ornamental seedlings are raised from seed or cuttings to transplant-ready plants, with the climate controlled for each stage.
- What is capillary irrigation and why is it used in propagation greenhouses?
- It is a sub-irrigation method in which the growing medium draws water up from below by itself. It gives every cell equal moisture, keeps foliage dry and saves water and fertiliser.
- How many tomato plants per m² in a greenhouse?
- The Turkish Ministry's soilless tomato greenhouse feasibility study assumes 2.68 plants/m² (2,680 plants per 1,000 m²) for the production greenhouse, consistent with the roughly 2.5 plants/m² recommended in Northern Europe. This is the number of seedlings planted in the production greenhouse, not the capacity of a propagation greenhouse; with double-stem or side-shoot growing, stem density is higher. Density is set by variety and growing system.
- Is public funding available for a propagation greenhouse?
- Support schemes for modern greenhouse investment, such as grants and reduced-interest loans, exist in many markets, but they vary by country and funding period and may change. The binding terms are those published by the relevant authorities. See "Funding and market conditions" below.
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