ed ▁on ▁the ▁water , ▁particularly ▁during ▁flo ods . ▁In ▁general ▁the ▁plant ▁is ▁adapted ▁to ▁flo ods ; ▁it ▁has ▁been ▁noted ▁to ▁grow ▁under water , ▁produce ▁an ▁infl ores c ence ▁above ▁the ▁surface , ▁blo om ▁and ▁produce ▁se eds ▁in ▁flo oded ▁conditions . ▁The ▁se eds ▁germ inate ▁when ▁they ▁fall ▁on ▁wet ▁substr ate , ▁or ▁sometimes ▁while ▁they ▁are ▁still ▁floating ▁about ▁on ▁the ▁water . ▁ ▁Today ▁the ▁land ▁next ▁to ▁the ▁rivers ▁is ▁protected ▁with ▁many ▁flo od ▁control ▁methods , ▁and ▁natural ▁flo od plain ▁activity ▁occurs ▁in ▁few ▁places . ▁The ▁rivers ide ▁landscape ▁has ▁been ▁modified ▁into ▁cro pl and , ▁with ▁mar sh es ▁and ▁pra i ries ▁dra ined , ▁w alled ▁off , ▁and ▁p low ed . ▁The ▁rivers ▁are ▁contained ▁with ▁le ve es , ▁controlled ▁by ▁lo cks , ▁and ▁accessed ▁via ▁mar inas . ▁While ▁the ▁plant ▁is ▁adapted ▁to ▁periodic ▁flo oding , ▁its ▁seed lings ▁can ▁only ▁germ inate ▁and ▁grow ▁in ▁clear ▁water ▁that ▁allows ▁sun light ▁in ; ▁flo oding ▁that ▁occurs ▁now ▁is ▁more ▁likely ▁to ▁be ▁tur bid ▁with ▁s ilt , ▁a ▁condition ▁the ▁plant ▁cannot ▁toler ate . ▁Rec ent ▁large ▁flo ods ▁have ▁been ▁noted ▁to ▁depos it ▁thick ▁layers ▁of ▁s ilt , ▁destroy ing ▁plants . ▁Also , ▁the ▁disturb ance ▁of ▁flo oding ▁is ▁rare ▁enough ▁now ▁that ▁rivers ides ▁become ▁over g rown ▁with ▁br ush , ▁sh ading