A particular brand is not required: affordable CC2652P USB sticks and other adapters from the Zigbee2MQTT list work well with GrowerHub. SONOFF remains a common branded option.
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: the enclosure and antenna vary by seller.
Verified GrowerHub
CC2652P USB Dongle
Budget coordinator with external antenna
A practical and affordable CC2652P option for Zigbee2MQTT. Similar sticks are available from many sellers.
In Zigbee2MQTT the zstack adapter is selected
Take the option with coordinator firmware
An external antenna is convenient for a greenhouse and several rooms