There are parts of my plantings where I put a plant in the ground, pat it on the head, and say 'good luck' knowing I will never drag a hose out that far. I usually plant these areas in early spring or late fall when I can count on rain to get them settled in. Some make it, others don't. My driveway shrub border is one. Also doesn't get weeded very often, as can be seen from this field side view.
For the rest of my beds, I don't have an irrigation system and occasionally remember to set up sprinklers. I also wander around with the hose & sprayer and blast things that look parched in late summer. But, hey, I live in the Pacific NW.