We have just installed a Rachio 3 Controller and in looking to setup the zones, I have discovered that the local gardeners have (as I always suspected) been overwatering the grass. I got a resident to dig a sod and they discovered that our St. Augustine grass roots are basically only 5cm. They never gave the grass a chance for the roots to need to search for water. So I am starting off our watering with 8cm root depth.
Is 8cm an appropriate starting depth ?
How often should I increase the depth increments ?
By how much should I increase the increments by ?