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How to kill backyard #929331

Asked April 23, 2026, 10:44 AM EDT

Hello! I have lost my backyard to weeds. I would like to kill it and set a base to plant ecograss seeds. This is my current plan, and I’m wondering if you could tell me if it’s the right course of action or not: 1. Till the yard, rake up debris, try to even out the soil 2. Cover in black plastic for 4-6 weeks 3. Repeat steps 1 and 2 4. Cover with fresh top soil 5. Plant grass seeds in fall I’ve attached some pictures of the yard as it currently exists. Any advice is appreciated!

Hennepin County Minnesota

Expert Response

I would simplify your plan bit. I don't think tilling and raking up plant debris is necessary. Black plastic works but clear plastic (occultation) has proven to work better.

Here is a link for more details on solarization and occultation you can decide: https://extension.umn.edu/planting-and-growing-guides/solarization-occultation

I suggest a soil test before adding top soil. Here's a link to more information and instructions: https://extension.umn.edu/managing-soil-and-nutrients/soil-testing-lawns-and-gardens

Do mix the new top soil in the top few inches so you don't have distinct layers of new and old. 

August is an excellent time to seed a new lawn. Link to more information on seeding a new lawn https://extension.umn.edu/lawn-care/seeding-and-sodding-home-lawns

Paul -Master gardener volunteer

An Ask Extension Expert Replied April 25, 2026, 10:38 PM EDT

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