June-seeded Michigan lawn has yellow nutsedge in front yard. Nutsedge is perennial; hard to control in new seed. Water new seed frequently (2x/day) shallowly to keep surface moist until germination. After emergence, gradually shift to deep weekly watering.
For nutsedge: no safe selective herbicide in new grass. Hand-pull, improve drainage, wait for fall pre-emergent (though nutsedge spreads by tubers, not seed). Focus on establishing thick turf to compete.
Resource: OSU nutsedge fact sheet.
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