| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'I Spy' | Small | Med-Green | Streaked | Yellow | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Ice Age' | Medium | Dark-Green | Medial | White | Unknown | Near-White | August to September | Schmid, Tom | .2002 |
| 'Ice Castle' | Small | Dark-Green | Medial | White | Sport | Light-Purple | June | Hansen, Hans | .2006 |
| 'Ice Follies' | Large | Dark-Green | Marginal | White | Sport | Pale-Lavender | July | Meyer, Bill | --NR-- |
| 'Iceman Cometh' | Small | Dark-Green | Streaked | Yellow | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Ichabod Crane' | Large | Med-Green | - | - | Hybrid | Pale-Lavender | June into July | Balitewicz, Bob | --NR-- |
| 'Incredible Hunk' | Giant | Blue/Green | - | - | Unknown | Pale-Lavender | July | Elslager, Ed | .1998 |
| 'Independence Day' | Giant | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July | Wade, Van | .1998 |
| 'Inka Dinka Do' | Small | Med-Green | Marginal | White | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Insurrection' | Medium | Med-Green | Marginal | White | Unknown | - | - | Dupre, Dirk | --NR-- |
| 'It's My Party' | Small | Med-Green | Medial | White | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Ivanhoe' | Medium | Med-Green | Marginal | White | Hybrid | - | - | Beilstein, Doug & Malloy, Alex | --NR-- |
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