Ciyawa na Reed wani nau'in ciyawa ce mai tsayi mai tsayi (sunan kimiyya: Phalaris arundinacea) wanda galibi ana samunsa a cikin dausayi, ramuka, da gefen rafuka da tafkuna. An san shi da ikon yin girma a cikin nau'ikan ƙasa iri-iri, kuma yana iya samar da tsayin daka wanda zai iya maye gurbin sauran nau'in shuka. Ana amfani da ciyawa na Reed sau da yawa don magance zaizayar ƙasa, azaman amfanin gona ga dabbobi, da kuma shukar ado a cikin lambuna da shimfidar ƙasa.