一般影響
香附子(Cyperus rotundus)大多被視為農業區和草坪的有害植物。它也會侵入受干擾的棲地。它被列在紐西蘭有害雜草名單中，禁止在紐西蘭銷售。
它也是澳大利亞聖誕島的有害植物(斯瓦布里克1997， PIER 1999)。
一個針對澳洲香附子(C. rotundus)的風險評估，得分是13分(拒絕)。它非常適合澳大利亞的氣候，歷史上被重複地從原生地引進到原生地之外。它是一個農業雜草，也是病原體和害蟲的寄主(PIER 2001)。
地點特有的影響：Pakistan 
農業: In Pakistan, purple nutsedge is one of the most common weeds found throughout the Indus valley during the summer season in major field crops such as cotton, sugarcane and maize (Iqbal Cheema & An 2008). Bryson et al. (2003, in Iqbal Cheema & An 2008) reported that purple nutsedge causes seed cotton yield reductions of 62–85%. Amasya (Turkey)
農業: Purple nutsedge is found at greater than 5% frequencies in onion production systems in the province of Amasya, Turkey. United States (USA)
滋擾人類: In the USA purple nutsedge is most important in cotton, maize, and home gardens (Bendixen & Nandihalli 1987).
農業: By 1939, uncontrolled purple nutsedge encroachment caused growers to abandon agricultural land (Godfrey 1939, in Webster 2005). Texas (United States (USA))
農業: Herbicides have benefitted the Cyperus species by eliminating interspecific weed competition (Keeley 1987, Webster and Coble 1997b, in Warren & Coble 1999). Purple and yellow nutsedge infestations continue to increase in many Texas peanut fields due to the use of dinitroaniline herbicides, which control most grass and small-seeded broadleaf weeds but have no effect on either nutsedge species (Grichar et al. 1992, Grichar and Nester 1997, in Warren & Coble 1999).
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