You have resistive soil sensors. I'd recommend replacing them with capacitive sensors - they are much more reliable. A good video with a short intro why resist

You have resistive soil sensors. I'd recommend replacing them with capacitive sensors - they are much more reliable. A good video with a short intro why resistive sensors suck, and what to pay attention to with capacitive sensors: https://www.youtube.com/watch?v=IGP38bz-K48 https://www.youtube.com/watch?v=IGP38bz-K48