{"id":25021,"date":"2024-10-24T15:15:03","date_gmt":"2024-10-24T19:15:03","guid":{"rendered":"https:\/\/extension.umaine.edu\/gardening\/?p=25021"},"modified":"2024-10-24T15:15:15","modified_gmt":"2024-10-24T19:15:15","slug":"25021","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/gardening\/2024\/10\/24\/25021\/","title":{"rendered":"What are the current thoughts on using corn gluten to discourage crab grass?"},"content":{"rendered":"

Question:<\/h3>\n

What are the current thoughts on using corn gluten to discourage crab grass?<\/strong><\/p>\n

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Answer:<\/span><\/p>\n

Jonathan Foster, Home Horticulture Outreach Professional<\/em><\/span><\/div>\n
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The UNH Extension has a great\u00a0resource for homeowners on controlling crabgrass<\/a>, including a nice summation of the corn gluten situation:<\/p>\n

“Some gardeners swear by the use of corn gluten as an organic pre-emergent herbicide, but university research to support its effectiveness is inconclusive. Research data show mixed results, and some studies have found that corn gluten does not work especially well against crabgrass. Corn gluten typically contains about ten percent nitrogen, and this fertilizer may help green up lawns and result in dense growth that out-competes weeds. Yet, it may contribute to ground and surface water contamination depending on the application rate and any other fertilizer products used. For weed control, the established recommended rate is 20 pounds per 1,000 square feet. At this rate, about 2 pounds of actual nitrogen are added to the lawn. However,\u00a0New Hampshire\u2019s turf fertilizer law<\/a>\u00a0allows no more than 0.9 pounds of actual nitrogen to be applied per 1,000 square feet per application. Thus, applying corn gluten at a rate that may suppress weeds puts the applicator on the other side of the lawn and may cause environmental harm. Corn gluten can certainly be used as an organic nitrogen fertilizer as long as no more than 0.9 pounds nitrogen per 1,000 square feet are applied at one time, not exceeding 3.25 pounds of nitrogen in a year.”<\/p>\n

The Maine turf fertilizer rules are\u00a0slightly different<\/a>, but the real takeaway here is that studies haven’t demonstrated effectiveness for the treatment. I recommend using the alternate methods of control from the UNH link above.<\/p>\n

Happy gardening.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Question: What are the current thoughts on using corn gluten to discourage crab grass? Answer: Jonathan Foster, Home Horticulture Outreach Professional The UNH Extension has a great\u00a0resource for homeowners on controlling crabgrass, including a nice summation of the corn gluten situation: “Some gardeners swear by the use of corn gluten as an organic pre-emergent herbicide, […]<\/p>\n","protected":false},"author":53,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[199],"tags":[],"class_list":["post-25021","post","type-post","status-publish","format-standard","hentry","category-ask"],"yoast_head":"\nWhat are the current thoughts on using corn gluten to discourage crab grass? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/gardening\/2024\/10\/24\/25021\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are the current thoughts on using corn gluten to discourage crab grass? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Question: What are the current thoughts on using corn gluten to discourage crab grass? 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