But if the soil is sandy or coarse it can't hold much water. If you can add some dry powdered up clay(so you can spread it evenly), and some humus (dead vegetative matter), than you add capacity to hold water, regardless of experts may tell you, it's win-win when growing anything.
Last year I watered everyday and had poor luck due to the weather, but this year I developed a F*** it mentality('if they WANT to live, fine if not, I'll find some that do') and the weather was awesome up until last week, but I've already gotten all I want off the bines. I am watering some this week just to strengthen the overall plant.
I have a fairly sandy loam, with one end of the row mostly sand, and the other end a nice mixture, with more humus. I need to amend one end, but haven't got to it, and since I have rings of plastic barrels surrounding the rhizomes, I have only amended inside the rings. I plant veggies in between the hops rows.