| No. | Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'American Thunderbolt' | Large | Med-Green | Medial | Yellow | Unknown | Unknown | Unknown | Wade, Van | --NR-- |
|
2
| 'Black Thunder' | Large | Dark-Green | Medial | White | Sport | Pale-Lavender | July into August | Schwarz, Jim & Schwarz, Karen & Zilis, Mark | .2014 |
|
3
| 'Blue Thunder' | Medium | Blue/Green | | - | Hybrid | Pale-Lavender | July into August | Zilis, Mark | --NR-- |
|
4
| 'Chief Thundercloud' | Giant | Blue/Green | | - | Hybrid | Unknown | Unknown | Wade, Van | --NR-- |
|
5
| 'Giantland Thunderstorm' | Medium | Light-Green | Streaked | White | Unknown | Unknown | - | Miller, Jeff | --NR-- |
|
6
| 'Green Thunder' | - | Unknown | | - | Unknown | Unknown | - | Unknown | --NR-- |
|
7
| 'Norwalk Thunder' | - | Unknown | | | Unknown | Unknown | - | Unknown (Listed) | --NR-- |
|
8
| 'Red Thunder' | Medium | Med-Green | | - | Hybrid | Unknown | - | Beilstein, Doug & Malloy, Alex | --NR-- |
|
9
| 'Rolling Thunder' | Large | Blue/Green | | - | Unknown | Near-White | June into July | Brashear, Carol | --NR-- |
|
10
| 'Rosedale Thunderheads' | Medium | Dark-Green | Marginal | Yellow | Hybrid | Light-Purple | July | Hadrava, Jerry | .2000 |
|
11
| 'Sea Thunder' | Large | Dark-Green | Medial | White | Sport | Light-Purple | July into August | Seaver, Mildred & Walek, Kevin & The American Hosta Society | .2009 |
|
12
| 'Thunder Boomer' | Medium | Blue/Green | | - | Hybrid | Pale-Lavender | July | Solberg, Robert | .2007 |
|
13
| 'Thunder Clouds' | Large | Blue/Green | | - | Unknown | Near-White | - | Lydell, Ransom | --NR-- |
|
14
| 'Thunderbolt' | Large | Blue/Green | Medial | White | Sport | Near-White | June into July | Crowder, Allen | .2020 |
|
15
| 'Thunderstorm' | Large | Blue/Green | Streaked | Yellow | Unknown | Unknown | - | Unknown | --NR-- |
|
16
| 'Tropic Thunder' | Medium | Med-Green | Marginal | Yellow | Hybrid | Unknown | Unknown | Ward, Dr Dick & Ward, Jane | .2012 |
|
17
| 'Tropical Thunder' | Large | Med-Green | Streaked | Yellow | Sport | Med-Lavender | July into August | Ahrens, Thomas | --NR-- |
|
18
| 'Wheaton Thunder' | Large | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Goodenough, Rick | --NR-- |
|
19
| 'Zimmerman Thunder' | Small | Dark-Green | | - | TC Sport | Pale-Lavender | July | Compton, Steve & Zilis, Mark | .2008 |
|