{"id":445,"date":"2026-02-13T18:01:07","date_gmt":"2026-02-13T18:01:07","guid":{"rendered":"https:\/\/extension.colostate.edu\/boulder\/?page_id=445"},"modified":"2026-02-26T20:48:17","modified_gmt":"2026-02-26T20:48:17","slug":"weeds","status":"publish","type":"page","link":"https:\/\/extension.colostate.edu\/boulder\/weeds\/","title":{"rendered":"Weeds"},"content":{"rendered":"\n<div class=\"wp-block-group alignfull is-layout-constrained wp-block-group-is-layout-constrained\">\n<header class=\"wp-block-group alignfull wp-block-pattern-interior-hero wp-block-pattern-hero is-content-justification-center is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-cover alignfull has-custom-content-position is-position-bottom-center wp-block-pattern-hero__cover\" style=\"min-height:285px;aspect-ratio:unset;\"><img loading=\"lazy\" decoding=\"async\" width=\"1606\" height=\"1080\" class=\"wp-block-cover__image-background wp-image-448 size-full\" alt=\"Closeup of Euphorbia esula, commonly known as green spurge or leafy spurge. The plants tops are yellowish-green heart-shaped bracts and the stems have small leaves emerging from all sides.\" src=\"https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png\" data-object-fit=\"cover\" srcset=\"https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png 1606w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=300,202 300w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=768,516 768w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=1024,689 1024w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=1536,1033 1536w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=1400,941 1400w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=600,403 600w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/leafy-spurge-3.png?resize=1568,1054 1568w\" sizes=\"auto, (max-width: 1606px) 100vw, 1606px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-black-background-color has-background-dim-0 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-block-cover-is-layout-constrained\">\n<h1 class=\"wp-block-heading wp-block-pattern-hero__heading has-hero-small-title-font-size\"><span class=\"is-style-highlight-heading\">Weeds<\/span><\/h1>\n<\/div><\/div>\n<\/header>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-135b063a wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\"><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">Weeds are basically plants that are interfering with how we think our property should look.\u00a0How a landowner manages their property can influence the number and type of weeds that they have.\u00a0Over-grazing pastures is one of the main reasons that weeds get a start on a property.\u00a0There are multiple methods landowners can use to manage their weeds, but the first step is to positively identify the weed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In simple terms a weed is just a plant out of place, however, managing some of these weeds is not a simple task. Noxious weeds are invasive non-native plants whose control is mandated by law. These plants pose a serious threat to native habitats, impact recreation and agriculture. They have displaced 130 native Colorado plants on 553,163 acres* in Colorado (*<strong><a href=\"https:\/\/ag.colorado.gov\/\" target=\"_blank\" rel=\"noreferrer noopener\">Colorado Dept of Agriculture<\/a><\/strong>).<\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"432\" src=\"https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/purple-loosestrife.jpg?w=768\" alt=\"Single purple loosestrife plant stem.\" class=\"wp-image-449 size-full\" srcset=\"https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/purple-loosestrife.jpg 768w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/purple-loosestrife.jpg?resize=300,169 300w, https:\/\/extension.colostate.edu\/boulder\/wp-content\/uploads\/sites\/33\/2026\/02\/purple-loosestrife.jpg?resize=600,338 600w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/div>\n<\/div>\n\n\n\n<hr aria-hidden=\"true\" class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-072004a0 wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50)\">\n<h2 class=\"wp-block-heading\">Weed ID Service<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first step in controlling weeds is knowing what weeds you are dealing with.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You may submit weed samples to our office for identification. Review \u201cGuidelines\u201d and fill out \u201cID Form\u201d. Call <a href=\"tel:3036786238\"><strong>303-678-6238<\/strong><\/a> with questions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/fremont.extension.colostate.edu\/wp-content\/uploads\/sites\/7\/2019\/12\/Weed-ID-Diagnostic-form-2019.pdf\">Weed ID Diagnostic form 2019<\/a><\/strong><\/li>\n\n\n\n<li><strong>Weed ID Sample Guidelines<\/strong><\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-072004a0 wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50)\">\n<h3 class=\"wp-block-heading is-style-default\"><span class=\"is-style-highlight-heading\">Resources<\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Identification<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/poisonousplants.cvmbs.colostate.edu\/home?_gl=1*1nwx5lo*_ga*MTE5MDk5MDEyNC4xNzYzMDU0MDIz*_ga_2HV0QS6SKP*czE3NzA0MDQ1MjEkbzUkZzEkdDE3NzA0MDU5NDMkajYwJGwwJGgw\" target=\"_blank\" rel=\"noreferrer noopener\">Guide to Poisonous Plants<\/a><\/strong><\/li>\n\n\n\n<li><a href=\"http:\/\/www.cwma.org\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Colorado Weed Management Association<\/strong><\/a> (noxious weed ID)<\/li>\n\n\n\n<li><a href=\"https:\/\/plants.usda.gov\/home\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Plants National Database | USDA NRCS<\/strong><\/a> (ID weeds and native plants)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Biological Weed Management (Insects)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.colorado.gov\/pacific\/agconservation\/biocontrol\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Biological Pest Control | CDA<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Organic Weed Management<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/cals.cornell.edu\/weed-science\/ecological-management\/organic-weed-management\" target=\"_blank\" rel=\"noreferrer noopener\">Organic Weed Management<\/a><\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/attra.ncat.org\/publication\/sustainable-weed-management-for-small-and-medium-sized-farms\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Weed Control Publications | ATTRA<\/strong><\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/weedecology.css.cornell.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Organic Weed Science | Cornell CALS<\/strong><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/extension.colostate.edu\/topic-areas\/agriculture\/capric-acid-a-promising-next-generation-herbicide-for-organic-specialty-crop-production-0-314\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Capric Acid: A Promising Next Generation Herbicide for use in Organic Systems<\/strong><\/a><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.ndsu.edu\/agriculture\/sites\/default\/files\/2025-04\/natural-herbicides.pdf\" target=\"_blank\" rel=\"noopener\">Natural Herbicide for Landscape Weed Management<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Chemical Weed Management<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Common Rangeland and Pasture Herbicides and Grazing Restrictions<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/ag-topics\/livestock\/grazing-management\/grazing-and-feeding-restrictions-herbicides\" target=\"_blank\" rel=\"noopener\"><strong>Grazing and Feeding Restrictions for Herbicides<\/strong><\/a><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/boulder.extension.colostate.edu\/wp-content\/uploads\/sites\/7\/2019\/12\/Single-Nozzle-Sprayer-Calibration.pdf\">Single Nozzle Sprayer Calibration<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Colorado Department of Agriculture Pesticides Program<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.colorado.gov\/pacific\/agplants\/pesticides\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Division of Plant Industry | CDA<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Local Sources for Weed Management<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.bouldercounty.org\/property-and-land\/land-use\/noxious-weeds\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Noxious Weeds and Invasive Species Management | Boulder County<\/strong><\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/www.longmontcolorado.gov\/departments\/departments-n-z\/parks-open-space-trails\/park-maintenance\/weed-and-pest-management\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Weed and Pest Management | City of Longmont<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Product Label Info<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"http:\/\/www.cdms.net\/LabelsMsds\/LMDefault.aspx?t=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Herbicide Label Search<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Colorado State University<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/agsci.colostate.edu\/cepep\/?_gl=1*88ozd*_ga*MTE5MDk5MDEyNC4xNzYzMDU0MDIz*_ga_2HV0QS6SKP*czE3NzA2NjUzODAkbzEwJGcxJHQxNzcwNjY1ODIwJGo2MCRsMCRoMA..\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Colorado Environmental Pesticide Education Program<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Noxious Weeds &amp; Invasive Species Management on Open Space<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.bouldercounty.org\/open-space\/management\/weeds\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Invasive Plants and Weed Management on Open Space | Boulder County<\/strong><\/a><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/law.justia.com\/codes\/colorado\/2017\/title-35\/pest-and-weed-control\/article-5.5\/\" target=\"_blank\" rel=\"noreferrer noopener\">Colorado Noxious Weed Act<\/a><\/strong> (Scroll down to Title 35.Agriculture, Pest and Weed Control, Article 5.5 Colorado Noxious Weed Act)<\/li>\n\n\n\n<li><a href=\"https:\/\/bouldervalley-longmontcd.colorado.gov\/programs-services\/noxious-weed-cost-share\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Noxious Weed Cost Share Program | Longmont and Boulder Valley Conservation District<\/strong><\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Weeds are basically plants that are interfering with how we think our property should look.\u00a0How a landowner manages their property can influence the number and type of&#8230;<\/p>\n","protected":false},"author":14,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-445","page","type-page","status-publish","hentry"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","pp_force_visibility":null,"pp_subpost_visibility":null,"pp_inherited_force_visibility":null,"pp_inherited_subpost_visibility":null,"pp_post_mime_type":"","acf":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/pages\/445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/comments?post=445"}],"version-history":[{"count":9,"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/pages\/445\/revisions"}],"predecessor-version":[{"id":1033,"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/pages\/445\/revisions\/1033"}],"wp:attachment":[{"href":"https:\/\/extension.colostate.edu\/boulder\/wp-json\/wp\/v2\/media?parent=445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}