ThirdReality Smart Soil Moisture Sensor

Quick verdict

Finally, a Zigbee soil moisture sensor that feeds real data into Home Assistant. Stick it in your garden bed or a potted plant and automate your watering based on actual moisture levels instead of guessing. Cheap enough to deploy several across different zones.

Standout: Zigbee soil moisture and temperature sensing for smart garden automations.

Notes last checked Mar 22, 2026.

Compatibility snapshot

Why it stands out

• measures both soil moisture and soil temperature
• affordable for monitoring multiple garden beds or pots
• Zigbee connectivity for fully local automations
• pairs well with the ThirdReality watering kit for automated irrigation

Reasons to hesitate

• Zigbee range may be limited outdoors, so plan your mesh accordingly
• requires a Zigbee coordinator
• probe durability in harsh weather is unproven long-term

Best for

• automating garden watering based on actual soil conditions
• monitoring houseplant moisture levels through Home Assistant

Avoid if

• your garden is far from your Zigbee mesh range
• you need professional-grade soil analytics

Privacy and local-control notes

Pure Zigbee sensor with no cloud dependency. Fully local operation through ZHA or Zigbee2MQTT.

Home Assistant support: supported · integration path: ZHA / Zigbee2MQTT.

Buying reality check

Price notes: Budget-friendly for a smart soil sensor. Pair with the watering kit for a complete automated irrigation setup.

Compare side by side: see sensor comparisons →

How to control irrigation without cloud

Learn how to control your irrigation system locally with Home Assistant, using open protocols and hardware that doesn't rely on cloud services.