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Soil Moisture Sensors: Calibrating for Turf vs Shrubs

Why One Threshold Does Not Fit All

Turf roots are shallow; shrubs pull from deeper layers. A single global threshold will overwater one and underwater another.

Calibration Steps

Baseline readings after irrigation and after dry-down. Map those to controller setpoints instead of guessing vendor defaults.

Sensor Placement

Install in representative soil, not in pure sand pockets or next to hardscape radiating heat.

Maintenance

Pull and inspect probes seasonally—roots and salts drift readings over time.

Frequently Asked Questions

Can I use one probe for multiple zones?

Only if soil and plantings match—otherwise add probes.

Do probes work with drip?

Yes—place near emitter wetting pattern.

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