Outdoor Soil Mosture Sensor

Have a few planter boxes on deck, would like to alert when they need watering. Anyone find a good outdoor soil moisture sensor I can tie in to Home Assistant?

Ecowitt makes an inexpensive soil moisture sensor and equally inexpensive gateway. There is a local integration. They also make weather monitors and temperature sensors. I have 2 in service with no issues for several years.

I am using the Gardena Sensors and Gateway. There is an integration for them