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Try to get grass to thrive #927852

Asked April 08, 2026, 4:42 PM EDT

I am in the process of sending soil samples from around my yard to the Soil Testing Lab. But in the mean time, I have two questions: 1) My yard probably needs aeration. What is the best method? The rental machine that dig the little cigar shapes seems like it might pack more than it aerates in the long run. 2) Do you have an opinion about "Fertigation," in which soluble fertilizer is injected into the sprinkler / irrigation line. On my sandy soil, that seems like a good way to provide tiny doses of fertilizer much more frequently than using a spreader monthly. However, I can find little more than general information about it, and nothing of cost comparisons. Thank you, tom

Hennepin County Minnesota

Expert Response

Thanks for the questions. It is great that you are starting with a soil test, which will determine what fertilizer application is needed.

Yes, aeration is helpful. The type with hollow tines creating those 'little cigars' is best. Check the attached link to determine if aeration is needed. Fall is the best time for aeration but you can do in the spring, after the lawn has been mowed twice. 

 https://extension.umn.edu/lawn-care/how-control-thatch-your-lawn

I am not familiar with fertigation. Typically, a lawn does not need frequent fertilization. Research shows one application in the fall is best. If necessary, a spring application may be applied.

Paul -Master Gardener volunteer


An Ask Extension Expert Replied April 08, 2026, 6:26 PM EDT

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