There are sprays that prevent the sandburs from sprouting and growing into plants. These preemergence products must be applied before the plants emerge in the early spring. Your County Extension Office can suggest specific products and timing of applications. There are also postemergence weed killers that are either general killers or selective for grasses.
The only other approach is to water and fertlize the area as grassburs thrive in poor, droughty, sandy soils. Then you would need to mow it regularly too. Probably not a good option.
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