Ntoo qhov rooj qhov rooj huv si, tsis muaj khawb, burrs thiab rauj cov cim. Cov khoom ntim hauv woodiness qhov rooj hluav taws yog siv avirulent ib puag ncig tiv thaiv hluav taws kub rwb thaiv tsev cov khoom, tsis tsuas yog txo tus nqi tsim khoom, tab sis kuj paub txog kev txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, ua lub luag haujlwm ntawm kev tiv thaiv ib puag ncig.