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If you go around and give each donut a healthy shot of Round Up once a month on a day after the sprinklers run, it will keep down the growth around the sprinkler heads. At least once a year remove the donut and clean out the area around the sprinkler head and reseat the donuts. After a period of time they start to sink into the ground and make the sprinkler heads more vulnerable to damage from the lawn mowing machinery.
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This may be a dumb question, but why not just do the Round Up thing and skip the donuts? I find all those concrete donuts to be an eyesore. I have never used them up North, but perhaps this will be a learning lesson about living in Florida with zoysia. I wish that there were a more aesthetic recourse than pieces of concrete around my yard and perhaps a small Round-Up enduced dead spot may be better than concrete.