Killing Weeds - Knowledgebase Question

Anaheim, CA (Zone 9B)
Avatar for jeadling
Question by jeadling
May 9, 2005
How do I kill an entire area of weeds? I would like to plant grass, but there are so many weeds.

Answer from NGA
May 9, 2005
You have a number of options. You can use a vegetation killer such as Glyphosate (Round-Up), Noxall or Casoron to kill all vegetation in the area, or you can solarize the soil, or you can use an organic herbicide. To solarize soil, you need to start during the hottest part of the summer, and leave the plastic in place for up to 3 months to kill disease pathogens and weed seeds. Start by smoothing out the area (removing sod, plant debris and rocks), moisten the soil, lay a 4 mm to 6 mm thick sheet of clear plastic over bare soil, and seal the edges of the plastic with rocks or soil. This will naturally heat up to over 140 degrees F, which kills most pathogenic organisms in the top 4-8" of the soil, depending on soil type and temperatures. Or, you might try an organic corn gluten-based herbicide. Gluten is a by-product of corn processing, and has been used in livestock feed, but researchers recently discovered that the gluten includes an enzyme that kills germinating seeds. And to top it all off, corn gluten provides nitrogen to the soil as it breaks down. Nature is amazing, huh? If you use chemical controls such as Round-Up there will be a waiting period before you can plant your grass so be sure to read and follow the label directions. Good luck with your new lawn!

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