| No. | Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'O Kanzashi' | Medium | Med-Green | | | Sport | Light-Purple | Unknown | Unknown | --NR-- |
|
2
| 'Oberland Thin Line' | Medium | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July to August | Rank, Stefan | --NR-- |
|
3
| 'October Sky' | Medium | Blue/Green | | | Hybrid | Near-White | August to September | Dean, Don | .2008 |
|
4
| 'Odd Goddess' | Medium | Med-Green | | | Hybrid | Pale-Lavender | June to July | Kwick, Charles | .2017 |
|
5
| 'Ogon Hime Tokudama' | Small | Light-Green | | | Unknown | Pale-Lavender | June to July | Unknown & Ruh, Peter | .2002 .2018 |
|
6
| 'Ogon Iwa' | Medium | Yellow | | | Unknown | Med-Lavender | August to September | Unknown | --NR-- |
|
7
| 'Ogon Sudare' | Small | Yellow | | | Unknown | Pale-Lavender | July | Unknown & Ruh, Peter | .2002 .2018 |
|
8
| 'Ogon Tachi' | Large | Light-Green | | | Unknown | Deep-Purple | August | Unknown & Ruh, Peter | .2002 .2018 |
|
9
| 'Ogon Tsushima' | Medium | Yellow | | | Unknown | Light-Purple | July to August | Unknown & Ruh, Peter | .2002 .2018 |
|
10
| 'Ohh! Blue Beacon' | Small | Blue/Green | | | Unknown | Near-White | June to July | Schulz, Ed | .2013 |
|
11
| 'Ohh! Blue Bounty' | Large | Blue/Green | | | Unknown | Near-White | June to July | Schulz, Ed | .2011 |
|
12
| 'Ohh! Blue Bruiser' | Giant | Blue/Green | | | Unknown | Med-Lavender | Unknown | Schulz, Ed | .2011 |
|
13
| 'Ohh! Blue Granite' | Medium | Blue/Green | | | Unknown | Near-White | June to July | Schulz, Ed | .2018 |
|
14
| 'Ohh! His Blue Eyes' | Large | Blue/Green | | | Unknown | Med-Lavender | June to July | Schulz, Ed | .2017 |
|
15
| 'Ohh! Jewel' | Large | Yellow | | | Unknown | Near-White | June to July | Schulz, Ed | .2017 |
|
16
| 'Ohh! Viola' | Medium | Yellow | | | Unknown | Near-White | June to July | Schulz, Ed | .2015 |
|
17
| 'OHS Margot's Delight' | Medium | Blue/Green | | | Sport | Pale-Lavender | July to August | Ontario Hosta Society | --NR-- |
|
18
| 'Ojibway' | Medium | Blue/Green | | | Unknown | Unknown | Unknown | Wade, Van | --NR-- |
|
19
| 'Old Bill' | Giant | Blue/Green | | | Hybrid | Pale-Lavender | June to July | Gilligan, Madelon | .2012 |
|
20
| 'Old Ironsides' | Giant | Light-Green | | | Sport | Med-Lavender | July | Summers, Alex | --NR-- |
|
21
| 'Old Smoky' | Large | Med-Green | | | Hybrid | Near-White | June to July | McDonell, Harold | .2014 |
|
22
| 'One Fine Day' | Medium | Med-Green | Marginal | Yellow | Hybrid | Near-White | June to July | Ward, Dr Dick & Ward, Jane | .2012 |
|
23
| 'Orphan Train Rider' | Small | Light-Green | | | Unknown | Med-Lavender | July to August | Kwick, Charles | .2017 |
|
24
| 'Orphan Train Ruffian' | Medium | Dark-Green | | | Hybrid | Pale-Lavender | July to August | Kwick, Charles | .2017 |
|
25
| 'Osiris Ovation' | Large | Yellow | | | Unknown | Pale-Lavender | Unknown | Fafard, Serge | --NR-- |
|
26
| 'Otara's Angel' | Large | Dark-Green | Marginal | Yellow | Sport | Near-White | June to July | Johns, Eddie | --NR-- |
|
27
| 'Ottawa' | Large | Med-Green | | | Unknown | Unknown | Unknown | Wade, Van | --NR-- |
|
28
| 'Ovalwood' | Large | Blue/Green | | | Hybrid | Near-White | July | Beilstein, Doug & Beilstein, Mardy | .2012 |
|