| No. | Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
|
1
| 'Oceans Blue' | Schmidt, Bevie | Large | Blue/Green | | - | Unknown | Unknown | July into August | .2009 |
|
2
| 'Ocean's Fury' | Rawson, Don | Large | Blue/Green | | - | Unknown | Unknown | - | --NR-- |
|
3
| 'Odd Ball' | Benedict, Dr Ralph (Herb) | Medium | Blue/Green | | - | Hybrid | Near-White | July | .1995 |
|
4
| 'Oh Cindy' | Benedict, Dr Ralph (Herb) | Medium | Light-Green | | - | Sport | Pale-Lavender | July | --NR-- |
|
5
| 'Oh to Be Fourteen' | Livingston, Ron | Large | Dark-Green | | - | Unknown | Unknown | - | --NR-- |
|
6
| 'Oh! Them Golden Slippers' | Elslager, Ed | Large | Yellow | | - | Hybrid | Light-Purple | July | .2002 |
|
7
| 'Okaydokey' | Walters Gardens & Walek, Kevin & The American Hosta Society | Medium | Yellow | Marginal | Dark Green | Sport | Pale-Lavender | July into August | .2009 |
|
8
| 'Okefenokee' | Benedict, Dr Ralph (Herb) & Walek, Kevin & The American Hosta Society | Medium | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | .2009 |
|
9
| 'Old Black Magic' | Elslager, Ed | Medium | Dark-Green | | - | Hybrid | Pale-Lavender | July | .1999 |
|
10
| 'Old Frosty' | Rawson, Don | Large | Blue/Green | | - | Unknown | Unknown | - | --NR-- |
|
11
| 'Olive Oil' | Dishon, Jim | Medium | Yellow | | - | Hybrid | Pale-Lavender | - | .1996 |
|
12
| 'Olympic Gold' | Banyai, Pauline | Medium | Yellow | | - | Unknown | Near-White | July into August | .1986 |
|
13
| 'OMG' | Livingston, Ron | Large | Blue/Green | Streaked | Yellow | Unknown | Unknown | - | --NR-- |
|
14
| 'On Golden Pond' | Elslager, Ed | Giant | Dark-Green | Marginal | Yellow | Hybrid | Near-White | July | .2005 |
|
15
| 'Once upon a Time' | Wilkins, Dr Jim & Wilkins, Sandy | Medium | Med-Green | Marginal | White | Hybrid | Near-White | August | .2002 |
|
16
| 'One Last Dance' | Hansen, Hans & Walters Gardens | Large | Dark-Green | Marginal | Yellow | TC Sport | Near-White | July | .2020 |
|
17
| 'One Man's Treasure' | Benedict, Dr Ralph (Herb) & Solberg, Robert | Medium | Dark-Green | | - | Sport | Light-Purple | August September October | .1999 |
|
18
| 'Ooh La La' | Elslager, Ed | Medium | Blue/Green | Medial | Yellow | Hybrid | Light-Purple | July | .2000 |
|
19
| 'Orange Crush' | Elslager, Ed | Medium | Med-Green | Marginal | Creamy White | Hybrid | Pale-Lavender | July | .2000 |
|
20
| 'Origami' | Pace, Glen | Small | Blue/Green | | | Unknown | Unknown | - | --NR-- |
|
21
| 'Orphan Child' | Banyai, Pauline & DaPra, Sarah | Medium | Med-Green | | - | Unknown | Light-Purple | June | .2000 |
|
22
| 'Out of the Blue' | Elslager, Ed | Giant | Blue/Green | Streaked | White | Hybrid | Pale-Lavender | July | .2003 |
|
23
| 'Outrageous' | Benedict, Dr Ralph (Herb) & Walek, Kevin & The American Hosta Society | Large | Dark-Green | Streaked | White | Hybrid | Pale-Lavender | July | .2009 |
|
24
| 'Outrigger' | Elslager, Ed | Large | Med-Green | Streaked | Speckles | Hybrid | Pale-Lavender | July | .2000 |
|
25
| 'Over the Rainbow' | Elslager, Ed | Large | Med-Green | Streaked | Speckles | Hybrid | Near-White | June into July | .2005 |
|
26
| 'Over the Waves' | Benedict, Dr Ralph (Herb) & Kuenster, Rod | Medium | Blue/Green | | - | Unknown | Unknown | August to September | .2010 |
|