Even with a sprinkler system, your lawn might sport some brown patches — especially in places where water runs off before the grass can absorb it. A soaker hose over the area would probably work, providing a slower rate of water flow over a longer period of time, but runoff could still be a problem. Watering crystals would work, but according to most experts they need to be tilled into the soil, and tearing up your yard will make things worse before they get better. A grass root irrigator is probably the best tool for the job.
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