when to fertilize lawn in illinois

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(September 1-15)

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  • When is the best time of year to fertilize your lawn?

  • The late fall fertilizer application is targeted for about when the lawn stops growing but the ground is not yet frozen. The later we get into November for example, the less likely the fertilization will be beneficial.

  • When is the best time to plant grass seed in Illinois?

  • For northern Illinois, the time to dormant seed would be the last week of November. The seed should be planted so there is good seed to soil contact. In the event we get early snow, do not plant the seed over the snow.

  • When is the best time of year to kill weeds in Illinois?

  • For northern Illinois, September into early October is a more favorable time period for controlling perennial broadleaf weeds. Why do some lawn areas turn brown or tan but others are still fairly green?

  • How much fertilizer do I put on my lawn?

  • EXAMPLE: 15-5-10 fertilizer, 7,000 sq ft, want to apply 1 lb. nitrogen/1,000 sq ft Therefore, need about 47 pounds of 15-5-10 fertilizer to cover entire lawn After calculating how much to apply, when to apply is the other important decision.

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