. ▁h ume ana ▁was ▁included ▁in ▁a ▁trial ▁of ▁Ros co ea ▁held ▁by ▁the ▁Royal ▁H ort icult ural ▁Society ▁from ▁ 2 0 0 9 ▁to ▁ 2 0 1 1 . ▁It ▁proved ▁hard y ▁( rating ▁H 4 , ▁i . e . ▁hard y ▁anywhere ▁in ▁the ▁British ▁Is les ) ▁and ▁grew ▁successfully . ▁Three ▁forms ▁and ▁one ▁cultiv ar ▁were ▁given ▁the ▁Award ▁of ▁Garden ▁Mer it : ▁▁ ▁R . ▁h ume ana ▁f . ▁h ume ana ▁– ▁the ▁typical ▁pur ple - flow ered ▁form ▁which ▁has ▁been ▁in ▁cultiv ation ▁longest ; ▁large ▁pur ple ▁flowers ▁ ▁R . ▁h ume ana ▁f . ▁l ute a ▁– ▁as ▁f . ▁h ume ana ▁but ▁with ▁pale ▁yellow ▁flowers ▁ ▁R . ▁h ume ana ▁f . ▁ty ria ▁– ▁shorter , ▁around ▁ 1 5   cm ▁in ▁flower ; ▁smaller , ▁dark er - pur ple ▁flowers ▁with ▁white ▁mark ings ▁towards ▁the ▁base ▁of ▁the ▁lab ell um ▁and ▁later al ▁st amin odes ; ▁sometimes ▁distributed ▁under ▁the ▁cultiv ar ▁name ▁' In k ling ' ▁ ▁R . ▁h ume ana ▁' Ste ph anie ▁Blo om ' ▁( subject ▁to ▁avail ability ) ▁– ▁also ▁compact , ▁with ▁" rich ▁pur ple " ▁flowers ▁and ▁wh it ish ▁fl oral ▁she ath s ; ▁short ▁leaves ▁at ▁flow ering ▁time . ▁ ▁For ▁propag ation , ▁see ▁Ros co ea : ▁Cult iv ation .