به منظور بررسی فلور و ساختار جوامع علفهای هرز مزارع و باغات شهرستان بردسکن، جمعیّت علفهای هرز این شهرستان در 10 محصول زراعی و باغی گندم، کلزا، چغندرقندپاییزه، پنبه، زیرهسبز، خربزه، پسته، انگور، انار و زعفران در سال 1395 مورد مطالعه قرار گرفت. نمونهبرداریها به صورت تصادفی و در ادامه به صورت سیستماتیک و طبق الگوی w با استفاده از کادر 5/0 در 5/0 متر انجام شد. در این مطالعه 106 گونه علفهرز متعلق به 30 خانواده گیاهی شناسایی شد که بیشترین تعداد گونه را تیرههای Poaceae(22 گونه)، Brassicaceae (15 گونه) و Asteraceae (13 گونه) به خود اختصاص دادند. از مجموع 106 گونه گیاهی شناسایی شده، 80 گونه (47/75 درصد) پهنبرگ و 26 گونه (53/24 درصد) باریکبرگ بودند. از نظر چرخه زندگی 82 گونه علفهرز (36/77 درصد) یکساله و 24 گونه (64/22 درصد) چندساله بودند. از نظر مسیر فتوسنتزی 82 گونه (36/77 درصد) دارای مسیر فتوسنتزی سهکربنه، 23 گونه (7/21 درصد) چهارکربنه و یک گونه (94/0 درصد) دارای مسیر فتوسنتزی CAM بودند. در بین محصولات مورد مطالعه، بیشترین تعداد گونه علفهرز متعلق به زعفران (61 گونه) و پسته (55 گونه) و کمترین تعداد گونه متعلق به پنبه (26 گونه) و کلزا (28 گونه) بود. در بین علفهای هرز پهنبرگ، تلخه، شاهی وحشی، شببوی صحرایی، سلمهتره، خارشتر، کهورک، هفتبند، پیچک، علفشور، آتریپلکس و در بین علفهایهرز باریکبرگ جوموشی، جودره، چچم، یولافوحشی، پنجهمرغی و خونیواش از نظر غالبیت نسبی، فراوانی و تراکم بوته در متر مربع بیشترین حضور و اهمیت را داشتند.
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