| No. | Hybrid Hostas | Pod Parent | x Pollen Parent | Source | Registered |
|
1
| 'Hakuyo' | Hosta pycnophylla | Unknown | Watanabe, Kenji & Ruh, Peter | .2002 |
|
2
| 'Kinba' | Hosta pycnophylla | Hosta pycnophylla | Watanabe, Kenji & Walek, Kevin & The American Hosta Society | .2009 |
|
3
| 'Ko Iwa' | Hosta longipes - | Unknown | Watanabe, Kenji | --NR-- |
|
4
| 'Kurumazaki' | Hosta montana - | Unknown | Watanabe, Kenji | --NR-- |
|
5
| 'Ogon Ko Urajiro' | 'Ko Urajiro' | Unknown | Watanabe, Kenji | --NR-- |
|
6
| 'Sanshoku Tsushima' | Hosta tsushimensis | Unknown | Watanabe, Kenji | --NR-- |
|
7
| 'Setsurei' | Hosta hypoleuca | Hosta pycnophylla | Watanabe, Kenji | --NR-- |
|
8
| 'Shichu-no-Tama' | 'Undulata' | Unknown | Watanabe, Kenji | --NR-- |
|
9
| 'Shima Kabitan' | 'Kabitan' | Unknown | Watanabe, Kenji | --NR-- |
|
10
| 'Taika Oba' | Hosta montana - | Unknown | Watanabe, Kenji | --NR-- |
|
11
| 'Urajiro Ko Iwa' | Hosta longipes - | Unknown | Watanabe, Kenji | --NR-- |
|