▁blo oms ▁in ▁late ▁summer ▁to ▁aut umn . ▁The ▁dense ▁or ▁loose ▁pan icle ▁is ▁long ▁ov ate , ▁sil very ▁white ▁or ▁less ▁often ▁yellow ish , ▁re dd ish ▁or ▁pur ple , ▁later ▁fe ath ery ▁and ▁ 3 0 ▁to ▁ 1 0 0 ▁cent im eters ▁long . ▁ ▁History ▁P amp as ▁Gr ass ▁is ▁listed ▁as ▁a ▁Class ▁C ▁no x ious ▁we ed , ▁which ▁is ▁also ▁known ▁as ▁Cort ader ia ▁s ello ana . ▁It ▁is ▁a ▁plant ▁native ▁to ▁the ▁area ▁of ▁the ▁p amp as ▁of ▁South ▁America . ▁There ▁are ▁many ▁different ▁species ▁of ▁this ▁grass , ▁all ▁of ▁which ▁have ▁become ▁invas ive ▁throughout ▁North ▁America . ▁This ▁plant ▁has ▁also ▁been ▁b anned ▁in ▁Hawai i ▁and ▁New ▁Zealand ▁because ▁of ▁its ▁ability ▁to ▁out g row ▁and ▁dis place ▁native ▁plants . ▁In ▁Europe , ▁it ▁was ▁first ▁introduced ▁in ▁the ▁United ▁Kingdom , ▁later ▁spread ing ▁to ▁other ▁countries ▁in ▁the ▁continent ▁like ▁Ireland , ▁Portugal , ▁Spain , ▁France , ▁and ▁Italy ▁. ▁ ▁Cult iv ation ▁ ▁The ▁plant ▁was ▁introduced ▁ ▁to ▁Europe , ▁North ▁America , ▁Australia ▁and ▁New ▁Zealand ▁as ▁an ▁orn amental ▁grass , ▁and , ▁to ▁a ▁less er ▁extent , ▁to ▁provide ▁food ▁for ▁gra zing ▁animals . ▁The ▁fe ath ery ▁flower ▁head ▁pl umes , ▁when ▁d ried , ▁are ▁widely ▁used ▁in ▁flower ▁arrang ements ▁and ▁other ▁orn amental ▁displays . ▁They ▁are ▁used