h ū h ū ▁is ▁a ▁popular ▁garden ▁plant ▁in ▁New ▁Zealand ▁and ▁over se as , ▁often ▁used ▁a ▁h edge ▁or ▁as ▁visual ▁back drop . ▁It ▁is ▁sometimes ▁grown ▁under ▁the ▁cultiv ar ▁name ▁' N ig ric ans ', ▁so ▁called ▁because ▁of ▁its ▁black ▁st ems . ▁In ▁h ort icult ure ▁it ▁is ▁val ued ▁for ▁its ▁col oured ▁fol i age ▁( c ult iv ated ▁variations ▁include ▁pur ple , ▁" sil ver " ▁and ▁var ieg ated ▁leaves ), ▁and ▁for ▁its ▁toler ance ▁of ▁some ▁h ort icult ur ally ▁difficult ▁growing ▁conditions , ▁including ▁dry ▁so ils ▁and ▁sh ade ▁( although ▁in ▁north west ▁Europe , ▁cold ▁and ▁exposed ▁situations ▁do ▁not ▁suit ▁it ). ▁ ▁Several ▁hy br ids ▁and ▁cultiv ars ▁have ▁been ▁developed ▁and ▁five ▁vari eties ▁won ▁the ▁Royal ▁H ort icult ural ▁Society ' s ▁Award ▁of ▁Garden ▁Mer it ▁due ▁to ▁their ▁ability ▁to ▁co pe ▁in ▁the ▁growing ▁conditions ▁of ▁the ▁United ▁Kingdom : ▁ ▁' G ar net ti i ' ▁ ▁' I rene ▁Pat erson ' ▁ ▁' Sil ver ▁Queen ' ▁ ▁' Tom ▁Th umb ' ▁ ▁' W arn ham ▁Gold ' ▁ ▁Host ▁of ▁threatened ▁wood ▁rose ▁▁ ▁K ō h ū h ū ▁has ▁the ▁potential ▁to ▁be ▁used ▁as ▁the ▁host ▁of ▁the ▁threatened ▁root ▁par as ite ▁plant ▁wood ▁rose ▁– ▁D act yl anth us ▁t aylor ii . ▁Wood ▁rose ▁was ▁recently