Nursery and Greenhouse Irrigation: Building a Bench Standard
Bench type, emitter spacing and filtration decide whether a nursery can service any bench with the same parts. How to set the standard once.
A nursery or greenhouse irrigation package is defined by the bench, not by the crop catalogue. Trays, pots, benches and beds each impose a different water delivery pattern and a different filtration requirement, and the package that works is the one whose components repeat across the growing area so the crew can service any bench with the same parts.
01 – Why each channel needs it, and where it is used
| Channel | Role in this decision | Why they need it |
|---|---|---|
| Distribution and wholesale | Hold a nursery set that repeats | Nursery buyers reorder consumables; a set that is easy to reorder keeps the account, while a mixed bag forces a new decision every season |
| Contractors and integrators | Build and retrofit greenhouse irrigation | The retrofit is the common job, and the package determines whether it takes a day or a week |
| Direct B2B users – nurseries, greenhouses, garden centres | Buy for their own benches | Uniformity across benches is what makes the watering schedule manageable; mixed components make it impossible |
| Specifiers and influencers – horticultural consultants, designers | Set the bench standard | The standard decides future expansion cost; a named component set is what keeps phases compatible |
It is used on propagation benches, pot and tray lines, hanging baskets, greenhouse beds and outdoor container areas. In each case the same positions appear – head, filter, main, bench lateral, emitter and control – and the package is defined by covering them at a repeatable quantity.
02 – How to make a preliminary selection
Start with how water lands on the plant. Trays and small pots are usually fed by micro-spray or drip emitters with close spacing; larger containers and beds suit drippers at wider spacing. The choice changes the filtration class and the line pressure, so it has to be made before the hardware list.
Then fix the bench standard: line diameter, emitter spacing, the connector type and the control family. A nursery that standardises can move a bench without redesigning it, and a new employee can be trained on one system.
Then confirm the filtration. Micro-spray heads and drippers are narrow passages: pressure-compensating dripline is specified at 120 mesh by both Rain Bird and Netafim, and micro-spray heads require comparable protection, so a filter belongs at the head of the package rather than on a separate order.
Finally, decide the control and the monitoring. A nursery with many small cycles benefits from a controller that can run several programmes, and a flow or pressure check at the head is the cheapest way to notice a bench that has drifted.
03 – Comparing the realistic options
The table frames the bench options a nursery actually chooses between.
| Bench type | Delivery | What it needs |
|---|---|---|
| Propagation trays | Fine mist or micro-spray | Close spacing, fine filtration, stable pressure |
| Pot lines | Drip emitters | Adjustable emitters, sturdy laterals |
| Hanging baskets | Individual drippers | Support, anti-siphon, easy inspection |
| Outdoor containers | Drip or micro-spray | UV-resistant line, wind-tolerant layout |
Across all four, the same rule applies: the emitter sets the filtration, and the bench spacing sets the layout. The package is the repeatable set that covers both.
04 – What goes wrong, and what still needs confirming
The frequent failures are uneven benches, blocked micro-spray heads, lines pulled tight across a walkway, and a schedule that suits one bench and over-waters another. Most of them are layout and standardisation issues rather than product faults.
Items to confirm in writing: the bench types and counts; emitter type and spacing; the filtration class; the control family and programme capacity; line pressure available; and the commercial terms – MOQ per item, price, lead time and reorder list.
05 – What we can supply and what to send
Delta AgriFlow supplies the nursery set: 16 mm micro-spray pipe and woven micro-spray hose for propagation, pressure-compensating dripline and drip and misting kits for pots and baskets, with filters, controllers and connectors completing the set.
Send six items: bench types and counts; pot or tray sizes; water source and pressure; filtration available; control requirement; and the reorder quantity for a normal month.
One number decides most nursery retrofits: how many benches share a valve. Too many, and the pressure at the far bench is different from the near one; too few, and the valve count and cost rise. The package should state the recommended bench count per valve rather than leaving it to the installer.
A second is the emitter spacing on a propagation bench. Mist and micro-spray coverage depends on overlap, and a bench that is misted at one end and dry at the other is a spacing problem, not a pressure problem. Spacing is part of the bench standard and should be written down.
A third is the filter’s position. On a nursery with several head sections, a single filter at the source protects everything downstream and gives one cleaning point. Per-bench filters look convenient and multiply the maintenance.
Container lines and bench lines should not share a schedule. Containers dry faster and need shorter, more frequent cycles; benches with trays hold water longer. A controller with separate programmes is the cheap way to keep the two apart.
Spare parts deserve a line in the offer: emitters, connectors and one element. A nursery cannot wait a week for a fitting, and the cost of the spares is a small fraction of a lost propagation cycle.
Where a greenhouse is being extended, the package should state the standard for the new section, not just the price. The extension will be installed by someone else, and the standard is what keeps the two compatible.
What to record at handover
A handover that consists of a working system and a verbal explanation is not a handover. Three things have to be written down: what was installed and where, what the settings are, and what the routine is. Record the bench count per valve, the emitter model and spacing, and the controller programmes with their run times.
The commissioning check matters as much as the record. Run the furthest bench first and check its pressure and its wetting pattern; a sample of emitter flows at the head and the far end confirms the layout. A reading taken once at commissioning is worth more than a datasheet, because it describes the installation rather than the product.
Finally, hand over the commercial part as clearly as the technical part. State the reorder list and the spare kit, and confirm which items are consumables rather than one-off purchases. Without it, the next order restarts from zero, and the advantage of a standard package disappears.
One commercial note worth stating plainly: nursery buyers judge a package by the season it survives, not by its first price. A set that is reorderable, standardised and complete will be bought again; one that saves ten per cent and needs three improvisations will be replaced.
Keep the specification sheet with the order. When a new bench is added two years later, the sheet is what lets a different installer match the existing work rather than start a second standard.
06 – Questions, sources and next steps
Can the same emitter serve trays and pots? Usually not. Trays need close, fine coverage; pots need a defined root-zone delivery. One standard for both compromises both.
Is a filter necessary on a clean mains supply? Yes, at the fine class the emitters require – a nursery that skips it discovers the cost at the first blocked propagation cycle.
How many benches per valve? As many as keep the far bench’s pressure within the emitter’s range. The package should state the number rather than leave it to the installer.
Where a nursery runs several crops on one bench, the emitter choice should follow the thirstiest crop, and the schedule should follow the driest. Both are compromises, and both are better than a compromise made by the person who happens to be watering.
One useful habit is to label each bench with its valve and programme reference. When a bench underperforms, the label tells the operator which schedule to check rather than which hose to blame.
A bench that is labelled with its valve and programme is a bench that gets fixed in minutes rather than by trial and error.
Information boundary
This article describes how the decision is structured. It is not a performance specification and does not state capacity, flow, pressure or service-life values for a specific product. Those values are confirmed per project after a written quotation; manufacturer figures cited are the published values for those products, not project commitments.
Reviewed: 2026-10-26. Next review after supplier specifications are confirmed in writing.
Sources and further reading
- Rain Bird XFA 13 mm dripline datasheet – 120 mesh filtration requirement, 50-350 kPa compensating range
- Netafim Techflow bid performance specification – 120 mesh or finer filtration, disc grades 40-200 mesh
- ISO 9912-1:2004 – Filters for micro-irrigation: classification
- ISO 18471:2015 – Verification of filtration grade
- FAO – Irrigation manual, Chapter 6: drip irrigation
Planning a nursery bench layout? Send bench counts and pot sizes through our quotation request.
