I havent watered mine for over two- three weeks....We have been getting good rain like once a week and its not been to hot at all.
I use a watering meter gauge thing for pots but not in the ground. The tap root would be down way deep.
Water guage would evaporate correct me if im wrong ?
Yeah the tap roots would be a fair way down but these water meters have a 30cm spike to drive down and as vnsmkr stated before if the soil is dry 2 inches under it means dry enough to water...i generally go by say 4-5 inches
I guess the way i think it is i dont want a "pause" in watering wet/dry in other words if the very bottom of roots is wet but 8 inches above are dry i want to water asap so the tap root gets a continous drink without pause and without flooding it to much so it just sits there...
Hope this makes some sense
I also water around my biggest plant in different areas each time and a fair way away from the stalk so as to encourage root growth as wide as possible
These methods are working for me this year very well