Cultivar NamePlant SizeLeaf ColorVariegationVar ColorOriginFlower ColorSeasonSourceRegistered
'Uncle Hirsch'-Blue/GreenMarginalYellowHybrid-August to SeptemberGraves, Butch.2008
'Unsung Hero'MediumMed-GreenMarginalYellowNat-SportLight-PurpleJulyHansen, Hans--NR--
'Upper Echelon'MediumBlue/Green--Hybrid-June into JulyWard, Dr Dick & Jane.2013
'Urajiro Izu Iwa'SmallDark-Green--UnknownMed-LavenderAugust to SeptemberUnknown & Walek, Kevin.2009
'Urajiro', H. rupifragaSmallMed-Green--Nat-SportDeep-Purple-Nigishi--NR--
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