| No. | Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'Oasis' (Ward) | Large | Blue/Green | - | - | Unknown | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .2012 |
|
2
| 'Ogon Hime Tokudama' | Small | Light-Green | - | - | Unknown | Pale-Lavender | June into July | Unknown & Ruh, Peter | .2002 .2018 |
|
3
| 'Ohh! Ludell' | Small | Yellow | - | - | Unknown | - | - | Schulz, Ed | .2009 |
|
4
| 'Ohh! Powder River Blue' | Large | Blue/Green | | - | Unknown | Near-White | June into July | Schulz, Ed | .2020 |
|
5
| 'Old Gnarly' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | - | Kruer, George | .2009 |
|
6
| 'Olympic Fab Five' | Medium | Yellow | - | - | Unknown | - | July into August | Freeman, Franc | .2012 |
|
7
| 'One-trip Salad Bar' | Small | Dark-Green | Marginal | Yellow | Nat-Sport | Med-Lavender | July into August | Solberg, Robert | --NR-- |
|
8
| 'Orphan Train Twins' | Medium | Dark-Green | | | Hybrid | Pale-Lavender | July | Kwick, Charles | .2021 |
|
9
| 'Oshimajishi' | Small | Dark-Green | Medial | Green | Hybrid | - | - | Unknown | --NR-- |
|
10
| 'Out of This World' | Medium | Dark-Green | | - | Hybrid | Light-Purple | June | Goodwin, Randy | .2020 |
|
11
| 'Ovalwood' | Large | Blue/Green | - | - | Hybrid | Near-White | July | Beilstein, Doug & Beilstein, Mardy | .2012 |
|