Cultivar NamePlant SizeOriginFlower ColorSeasonSourceRegistered
'Oakview'SmallUnknownMed-LavenderJune into JulyStone, David & Ruh, Peter.1987
'Oasis' (Ward)LargeUnknownNear-WhiteJune into JulyWard, Dr Dick & Ward, Jane.2012
'Oberland Blue Dimension'MediumHybrid--Rank, Stefan--NR--
'Ocean Tide'LargeHybridNear-WhiteJune into JulyMondt, Manfred--NR--
'Oceans Away'GiantUnknown-June into JulyHanson, Curt--NR--
'Oceans Blue'LargeUnknown-July into AugustSchmidt, Bevie.2009
'Ocean's Fury'LargeUnknown--Rawson, Don--NR--
'October Sky'MediumHybridNear-WhiteAugust to SeptemberDean, Don.2008
'Odd Ball'MediumHybridNear-WhiteJulyBenedict, Dr Ralph (Herb).1995
'Oder'MediumUnknownMed-LavenderJuly into AugustKlose, Heinz--NR--
'Odina'LargeUnknown--Wade, Van--NR--
'Oglala'GiantUnknown--Wade, Van--NR--
'Oh! Susanna'MediumHybridMed-LavenderJune into JulyReuter, Laurence & Gilligan, Madelon.2015
'Ohh! Blue Beacon'SmallUnknownNear-WhiteJune into JulySchulz, Ed.2013
'Ohh! Blue Bounty'LargeUnknownNear-WhiteJune into JulySchulz, Ed.2011
'Ohh! Blue Bruiser'GiantUnknownMed-Lavender-Schulz, Ed.2011
'Ohh! Blue Granite'MediumUnknownNear-WhiteJune into JulySchulz, Ed.2018
'Ohh! Blue Otto'SmallUnknown--Schulz, Ed.2009
'Ohh! His Blue Eyes'LargeUnknownMed-LavenderJune into JulySchulz, Ed.2017
'Ohh! Ultra Aqua'MediumUnknown--Schulz, Ed--NR--
'Ohio Blue'-Unknown--Wade, Van--NR--
'OHS Bryan's Blue'MediumHybrid--Ontario Hosta Society--NR--
'OHS Juno'MediumSportPale-LavenderJuly into AugustOntario Hosta Society--NR--
'OHS Margot's Delight'MediumSportPale-LavenderJuly into AugustOntario Hosta Society--NR--
'Ojibway'MediumUnknown--Wade, Van--NR--
'Okobaji'SmallUnknown--Tompkins, Chet & Ruh, Peter & Ruh, Jean.2008
'Old Bill'GiantHybridPale-LavenderJune into JulyGilligan, Madelon.2012
'Old Cadillac'LargeUnknownPale-LavenderJuneDiesen, Bernie & Diesen, Jane.1998
'Old Cardboard Boxes'LargeUnknown--Marcelle, Eric--NR--
'Old Frosty'LargeUnknown--Rawson, Don--NR--
'Old Gnarly'LargeHybridPale-Lavender-Kruer, George.2009
'Old Rough House'GiantUnknown--Wade, Van--NR--
'Olivia'MediumUnknownNear-White-Schwarz, Jim--NR--
'Olympic Silver Medal'MediumSportPale-LavenderJuly into AugustFransen, Marco & Naylor Creek Nursery--NR--
'Omaha'LargeUnknown--Wade, Van--NR--
'Oma's Sunrise'LargeUnknown--Sisson, Kathie--NR--
'Ontario Blue'LargeUnknown--Wade, Van--NR--
'Open Hearted'GiantUnknown-JulyWade, Van.1999
'Orion's Belt'LargeHybridPale-LavenderJulyWard, Dr Dick & Ward, Jane.2003
'Osiris Blue Night'LargeUnknown--Fafard, Serge--NR--
'Osiris Sentinelle'LargeUnknown--Fafard, Serge--NR--
'Osprey'MediumUnknownPure-WhiteJune into JulySmith, Eric & British Hosta and Hemerocallis Society.1988
'Our Friend Reldon'LargeHybrid--Van Wyke, Trudy--NR--
'Ovalwood'LargeHybridNear-WhiteJulyBeilstein, Doug & Beilstein, Mardy.2012
'Over the Waves'MediumUnknown-August to SeptemberBenedict, Dr Ralph (Herb) & Kuenster, Rod.2010
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