One Tap, Separate Schedules for Lawn, Beds and Pots

Zone by watering job, not by distance

A lawn sprinkler, raised-bed drip line, greenhouse grow bags and patio pots should rarely share one programme. Their roots, storage volume, exposure and delivery methods respond differently even when they sit beside one another.

The purpose of a multi-zone plan is not to fill four outlets. It is to prevent one schedule from overwatering one group while leaving another dry. A correct plan might use two, three or four zones; an unused outlet is a valid result.

This page decides which areas should share a schedule. Controller selection belongs in the automatic watering guide, and physical four-zone commissioning belongs in the installation walkthrough.

Build a garden evidence map

Walk the garden and record each candidate group:

Do not use appearance alone. A dark soil surface can hide dry material below, while midday leaf response can reflect heat rather than a dry root zone. Inspect at a consistent depth without damaging roots.

Decide whether two areas can share

Two areas can share a zone when all of these are sufficiently similar:

• plant water need and growth stage;
• root-zone volume and material;
• sun, wind and shelter;
• delivery method and output rate;
• acceptable frequency and runtime;
• seasonal start and shutdown pattern.

Distance from the tap is only a hydraulic consideration. Two neighbouring groups may need separate programmes; two distant borders may share when their conditions and delivery hardware match.

Write one sentence explaining every shared zone. If the sentence relies only on convenience, revisit it.

Lawn: prove coverage before choosing runtime

Sprinkler performance varies with nozzle, pressure, wind and geometry. Place straight-sided catch containers across the target area and run a short test. Look for a consistent pattern, missed corners and water landing on paths or walls.

RHS guidance favours thorough watering where needed over frequent shallow wetting, while recognising that lawns can often recover from temporary browning. The right response depends on lawn condition and local restrictions; automatic lawn watering should not be the default merely because an outlet is free.

Keep lawn sprinkler demand separate from low-flow drip lines. Run it sequentially when combined demand would reduce pressure elsewhere.

Beds and borders: inspect below the surface

Established borders generally hold more moisture than small containers. Drip line or a suitable soaker method can apply water at soil level, but distribution still requires inspection.

Run a short test, then check the wetting width and depth at several points. Clay-rich soil may spread laterally and drain slowly; sandy soil may drain quickly with less sideways movement. Those observations shape line position and runtime more reliably than a copied timetable.

New planting may temporarily need different attention from an established border. Treat establishment as a dated exception and merge the group later only after observation supports it.

Raised beds: edge, depth and crop groups matter

Raised beds can warm and drain differently from surrounding ground. Bed depth, soil mix and exposed edges alter the result. A broad bed may need more than one lateral after a wetting test; that does not automatically mean a separate controller outlet for each lateral.

Manifold several compatible laterals within one hydraulic zone only when the source can supply them and their plants share a programme. Use the raised-bed layout guide before installation.

Pots and baskets: small volume, fast consequences

Containers have limited reserves and can vary greatly in size, material and exposure. Grouping every pot together may still be too crude.

Check emitter output and the actual compost response. A large shaded pot and a small dark hanging basket may need different delivery or manual attention even when both are “containers”. Rearranging pots into compatible groups can simplify the control system more effectively than adding outlets.

Keep drippers secured and visible. A displaced micro-tube can empty beside a pot while the controller reports a normal run.

Greenhouse: separate enclosure from outdoor rain

Outdoor rainfall does not water a closed greenhouse. Ventilation, shading, container size and crop stage can move greenhouse demand independently of outside beds.

Give the greenhouse a separate zone when its programme or inspection rhythm differs. Within it, do not combine established root-level drip with propagation mist merely because both are behind glass; they solve different tasks.

The greenhouse setup guide covers routing and commissioning. Holiday resilience is handled separately.

Measure the supply and delivery demand

Measure bare-tap flow with a bucket and stopwatch:

litres per minute = bucket litres / seconds x 60

Then calculate or measure demand for each proposed zone using the current specifications of its emitters or sprinkler. A four-outlet controller does not produce four times the water.

If one zone is too demanding, redesign its delivery hardware or divide it on hydraulic grounds. If several zones are individually suitable but too demanding together, stagger them.

Create starting schedules without pretending certainty

For each zone, choose a conservative first runtime based on measured delivery and observed root condition. Record weather, programme and next-day soil result for seven days.

Change one variable at a time. Increasing frequency and runtime together prevents learning. Pause after meaningful rain for outdoor groups when appropriate, but remember that greenhouse and sheltered containers may receive none of it.

Remote control can make adjustments easier; it does not observe roots, detect every leak or prove a final emitter is flowing.

A four-zone example, not a prescription

One mixed garden might produce:

• Zone A: patio pots on micro-drip;
• Zone B: compatible raised beds on regulated drip;
• Zone C: greenhouse root-level drip;
• Zone D: lawn sprinkler used only when justified.

Another garden might combine beds and borders, hand-water pots and use only two outlets. The evidence map, not the product body, decides.

Johgee's four-zone RF timer may fit the first map when its published pressure and flow requirements are satisfied. It does not establish the horticultural groups for you.

Field evidence from our garden

Sources

• RHS garden watering methods
• RHS container watering
• RHS vegetable watering
• Johgee four-zone RF timer specification

How this guide was prepared

The previous live page opened with unrelated raised-bed copy and repeated the site's generic build sequence. This revision uses plant and root evidence to decide zone membership, then limits hardware discussion to hydraulic feasibility. It does not publish universal litres, minutes or frequencies and does not infer product reliability from an app status.

Checked 16 August 2026.