For the first monitoring, one Zigbee temperature and humidity sensor is sufficient. The screen is convenient for checking readings on site, and soil and leakage sensors can be added at any time.
You do not need an expensive branded kit to get started. Choose an option that suits your budget and make sure the listing says Zigbee rather than Wi-Fi or Bluetooth. Search links are neutral, have no affiliate tags, and availability varies by country and seller.
Example appearance: generic models use different enclosures and model IDs.
Verified GrowerHub
Zigbee 3.0 LCD TH
Temperature and Humidity with LCD Screen
An accessible sensor that shows values locally and sends them to Zigbee2MQTT.
The screen makes it easy to compare local readings with the dashboard
In the product card, select the option Zigbee 3.0
The actual model ID GrowerHub will show after connection
Most retail Wi-Fi sensors from Tuya and similar ecosystems depend on the manufacturer's cloud and do not let you configure GrowerHub MQTT. Suitable exceptions are devices with open local MQTT configuration and GrowerHub hardware.
Start with compatible equipment
Connect a coordinator and one Zigbee sensor first. You can add more devices later.