{"id":18426,"date":"2021-12-22T13:41:12","date_gmt":"2021-12-22T18:41:12","guid":{"rendered":"https:\/\/extension.umaine.edu\/gardening\/?p=18426"},"modified":"2021-12-22T13:44:39","modified_gmt":"2021-12-22T18:44:39","slug":"how-do-you-eradicate-knotweed-and-replace-with-a-native-plant","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/gardening\/2021\/12\/22\/how-do-you-eradicate-knotweed-and-replace-with-a-native-plant\/","title":{"rendered":"How do you eradicate knotweed and replace with a native plant?"},"content":{"rendered":"

Question:<\/h3>\n

I have an area about 200 square feet where we cut, treated and then scraped out knotweed this fall. We know it will be a constant battle to try to completely eradicate for the next few years but would like to replant the area with something native and invasive-ish to help with squeezing out the rhizomes. The area has southern exposure between a house and an outdoor patio with plenty <\/b>of<\/span> moisture but not a bog.\u00a0 <\/b>The knotweed was a wonderful seasonal screen and the birds used it for cover.\u00a0 We’d love something on the taller side.\u00a0 I’m committed to only adding native plants. I understand <\/b>from<\/span> my research that something with rhizomes is a good idea. Any help is appreciated!<\/b><\/p>\n

Answer:<\/h3>\n

Marjorie Peronto, Extension Educator
\n<\/em><\/p>\n

\n
Thank you for your great question.\u00a0 I do not know\u00a0of<\/span>\u00a0any plant, native or otherwise, that can outcompete Japanese Knotweed.\u00a0 I am hesitant to recommend that you replant the cleared area with anything else until you know the level\u00a0of<\/span>\u00a0resprouting that may occur.\u00a0 Even the smallest fragments\u00a0of<\/span>\u00a0Japanese Knotweed rhizomes or stems that were left behind have the potential to resprout.\u00a0 They would be very difficult to remove once you’ve planted a spreading perennial, herbaceous or woody,\u00a0in<\/span>\u00a0that area.\u00a0 My suggestion would be to smother the area for at least one year (preferably more) using the method described on pages 7 and 8\u00a0of<\/span>\u00a0this bulletin\u00a0Preventing the Spread\u00a0of<\/span>\u00a0Japanese knotweed<\/a>\u00a0from<\/span>\u00a0the New Hampshire Department\u00a0of<\/span> Agriculture.<\/div>\n<\/div>\n
<\/div>\n
Once you are confident that you’ve got the knotweed eradicated (mostly), I’m thinking that a planting\u00a0of<\/span>\u00a0our native Northern Bayberry (Morella pensylvanica<\/a>, formerly called Myrica pensylvanica) may be suitable for that site.\u00a0 It is an exuberant, rhizomatous, colonizing shrub that thrives\u00a0in<\/span>\u00a0full sun to part shade, evenly moist to dry soils, which will provide a seasonal screen and terrific habitat for birds.\u00a0 This species is dioecious, with separate male and female plants, so you would want to make sure to purchase both sexes (it is easiest to identify the female plants when they are\u00a0in<\/span> fruit).<\/div>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"

Question: I have an area about 200 square feet where we cut, treated and then scraped out knotweed this fall. We know it will be a constant battle to try to completely eradicate for the next few years but would like to replant the area with something native and invasive-ish to help with squeezing out […]<\/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":[199,205],"tags":[],"class_list":["post-18426","post","type-post","status-publish","format-standard","hentry","category-ask","category-habitat"],"yoast_head":"\nHow do you eradicate knotweed and replace with a native plant? - 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\/2021\/12\/22\/how-do-you-eradicate-knotweed-and-replace-with-a-native-plant\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How do you eradicate knotweed and replace with a native plant? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Question: I have an area about 200 square feet where we cut, treated and then scraped out knotweed this fall. 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