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Weed Control Guidelines
- Perennial grassy weeds (nimblewill, creeping bentgrass, etc.) are not effectively controlled in the spring with glyphosate (Roundup or Kleen Up). Plan this type of renovation for the late summer.
- Avoid using broadleaf herbicides in newly-seeded areas until the new seedlings have been mowed at least three times.
- Avoid using preemergent crabgrass controls (except those containing siduron) at the same time as a spring seeding.
As a general recommendation, delay the use of these materials until the new seedlings have been mowed four to eight times, depending on the herbicide. Check the label of the specific crabgrass control material for the exact recommendations. As mentioned earlier, siduron is an exception to this rule. It can be used at the time of seeding, but will only control crabgrass for 3 or 4 weeks.
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