I have ½GPH (gallons per hour) drippers watering 3' tall tomato plants in pots. How long and when should I set the timer to water them? They are in an arid climate.
I grow my tomatoes in 21" pots and use drip irrigation. I run them 10 minutes twice a day. I also have about 2-3" of cypress mulch on top to help fight evaporation. I sometimes have to adjust this time if we have a rainy spell. Pick a time and try it and then adjust accordingly to dial it in to what works best for your plants. If you have a moisture meter, it will make it easier to see how much water is actually getting down to the root area.