| Medium Size Hostas | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'I Bluit' | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Benedict, Dr R. (Herb) & Kuenster, Rod | .2010 |
| 'Ian Winslow' | Yellow | Marginal | Green | Nat-Sport | Pale-Lavender | July into August | Stark, Gunther | --NR-- |
| 'Ice Age' | Dark-Green | Medial | White | Unknown | Near-White | August to September | Schmid, Tom | .2002 |
| 'Ice Cave' | Med-Green | Streaked | White | Hybrid | - | - | Moore, Jeff | --NR-- |
| 'Ice Cream' | Med-Green | Marginal | Greenish White | Nat-Sport | Pale-Lavender | July | Rossing, Richard | .1998 |
| 'Ice Cream Streaked' | Med-Green | Streaked | Yellow | Nat-Sport | Med-Lavender | July | Unknown | --NR-- |
| 'Ice Palace' | Blue/Green | - | - | Hybrid | Near-White | June | Ward, Dr Dick & Jane | .2003 |
| 'Iceland' | Med-Green | Medial | White | Hybrid | - | - | Smith, Eric | --NR-- |
| 'Icy Fog' | Dark-Green | Medial | White | Nat-Sport | Med-Lavender | June into July | Wilson, Chris | --NR-- |
| 'Iggie' | Yellow | - | - | Unknown | Pale-Lavender | July | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Iichiro' | Med-Green | Marginal | White | Unknown | - | - | Gowen, Hideko | --NR-- |
| 'I'll Have Another' | Med-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | August | Silvers, Bill | .2012 |
| 'I'm My Kid's Mom' | Med-Green | Streaked | White | Hybrid | Pale-Lavender | July into August | Elslager, Ed | .2003 |
| 'Immerse' | Med-Green | Marginal | White | Unknown | Light-Purple | - | Unknown | --NR-- |
| 'Impact' | Med-Green | Marginal | White | Unknown | Pale-Lavender | July | Lydell, Ransom | --NR-- |
| 'Imperial Moth' | Light-Green | - | - | Unknown | Light-Purple | July | Seaver, Mildred | .2004 |
| 'In the Ruff' | Light-Green | - | - | Nat-Sport | Pale-Lavender | July | Unknown | --NR-- |
| 'Inaho' | Dark-Green | Streaked | White | Unknown | Light-Purple | August to September | Unknown & Ruh, Peter | .2005 .2018 |
| 'Incoming' | Dark-Green | - | - | Hybrid | Pale-Lavender | July | Deckert, Emile & Jane | .2004 |
| 'Independence' | Dark-Green | Marginal | White | Nat-Sport | Pale-Lavender | August | Westendorp, Jeff & Walters Gardens | .2001 |
| 'Indian Summer' (Summers) | Med-Green | - | - | Unknown | - | - | Summers, Alex | --NR-- |
| 'Indiana Blue' | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Balitewicz, Bob | --NR-- |
| 'Indiana Knight' | Med-Green | Marginal | Chartreuse | Nat-Sport | Pale-Lavender | July | Goodwin, Randy | .1990 |
| 'Indigo' | Blue/Green | - | - | Hybrid | Near-White | July | Savory, Robert | .1984 |
| 'Indy Finish Line' | Med-Green | Medial | Creamy White | Unknown | Pale-Lavender | July into August | Whitmore, Bob & Goodwin, Randy | .2005 |
| 'Indy Winners' Circle' | Yellow | Marginal | Green | Nat-Sport | Near-White | August | Dove, Bill & Wanda & Indianapolis Hosta Society | .2006 |
| 'Infatuation' | Blue/Green | - | - | Hybrid | Deep-Purple | August to September | Solberg, Robert | .2016 .2018 |
| 'Inky Dinky' | Light-Green | - | - | Nat-Sport | Light-Purple | July | Trucks, Gary | --NR-- |
| 'Inland Sea' | Dark-Green | - | - | Hybrid | Light-Purple | August | Sugita, Hajime & Zilis, Mark | .1998 |
| 'Innisglow' | Yellow | - | - | TC Sport | Pale-Lavender | June into July | Zilis, Mark & Walek, Kevin | .2009 |
| 'Innisjade' | Dark-Green | - | - | TC Sport | Pale-Lavender | June into July | Zilis, Mark & Walek, Kevin | .2009 |
| 'Inniswood' | Yellow | Marginal | Green | Nat-Sport | Pale-Lavender | June | Innis Metro Botanical Garden | .1993 |
| 'Innovation' | Dark-Green | - | - | Hybrid | Pure-White | - | Nesmith, Elizabeth & Ruh, Peter | .1996 |
| 'Inocquous' | Med-Green | Marginal | Yellow | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Inspire Greatness' | Blue/Green | Marginal | White | Unknown | Pale-Lavender | June | Silvers, Bill | .2006 |
| 'Insurrection' | Med-Green | Marginal | White | Unknown | - | - | Dupre, Dirk | --NR-- |
| 'Intrigue' | Med-Green | Streaked | - | Hybrid | Pale-Lavender | July | Aden, Paul | .1978 |
| 'Invincible' | Med-Green | - | - | Unknown | Pale-Lavender | August | Aden, Paul | .1986 |
| 'Invincible Spirit' | Yellow | - | - | Hybrid | Pale-Lavender | August | Zonneveld, Ben & Philips, Hugo | --NR-- |
| 'Invocation' | Yellow | Marginal | White | Hybrid | - | - | Lysne, Rod | --NR-- |
| 'Iona' | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July | Lavender & BHHS | .1988 |
| 'Iowa City Lights' | Med-Green | Streaked | Yellow | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Iowa Hawkeye' | Dark-Green | Medial | Yellow | Nat-Sport | Light-Purple | July into August | McBurney, Jim & Lois & Kuenster, Rod | .2006 |
| 'Iowa Moon' | Yellow | Marginal | Light Green | Nat-Sport | Pale-Lavender | July into August | Simmering, Ron | .2000 |
| 'Iowa Moonshine' | Yellow | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Irische See' | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Klose, Heinz & Ruh, Peter | .1998 |
| 'Irish Breeze' | Med-Green | Medial | Yellow | Nat-Sport | Pale-Lavender | June | Scolnik, Patricia & Walek, Kevin | .2009 |
| 'Irish Eyes' | Med-Green | Marginal | Creamy White | Hybrid | Pale-Lavender | - | Ward, Dr Dick & Jane | .1999 |
| 'Irish Jig' | Dark-Green | Marginal | White | Hybrid | Near-White | July into August | Ward, Dr Dick & Jane | .2012 |
| 'Irish Longlegs' | Dark-Green | - | - | Hybrid | - | - | Barta, Jack | --NR-- |
| 'Irish Moon' | Blue/Green | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Irish Moss' | Med-Green | - | - | Unknown | Pale-Lavender | July | Deckert, Emile & Jane | .2004 |
| 'Irish Pastures' | Light-Green | Marginal | White | Nat-Sport | Pure-White | July into August | Goodwin, Randy | .2006 |
| 'Irish Spring' | Med-Green | Streaked | Yellow | Unknown | Pale-Lavender | July | Savory, Robert | .1985 |
| 'Iron Curtain' | Blue/Green | - | - | Hybrid | Near-White | June into July | Asch, Stuart | .2000 |
| 'Iron Gate Bouquet' | Dark-Green | - | - | Hybrid | Light-Purple | August | Sellers, Van | .1983 |
| 'Iron Gate Delight' | Dark-Green | Marginal | White | Hybrid | Pure-White | July into August | Sellers, Van | .1981 |
| 'Iron Gate Special' | Med-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | August | Sellers, Van & Santa Lucia, Vic & Walek, Kevin | .2009 |
| 'Iron Gate Supreme' | Med-Green | Streaked | White | Hybrid | Pale-Lavender | August | Sellers, Van | .1980 |
| 'Island Breeze' | Med-Green | Medial | Yellow | TC Sport | Med-Lavender | July into August | Diaz, Ariel & Hansen, Hans & Walters Gardens | .2014 |
| 'Island Fling' | Blue/Green | Marginal | Yellow | Nat-Sport | - | July into August | Blake, Amanda | .2016 |
| 'Island Flourish' | Light-Green | - | - | Hybrid | - | June into July | Blake, Amanda | .2016 |
| 'Island Sun' | Yellow | - | - | Hybrid | Near-White | June | Blake, Amanda | --NR-- |
| 'Island Velvet' | Dark-Green | - | - | Unknown | - | July into August | Blake, Amanda | .2016 |
| 'Islip Gold' | Yellow | - | - | Unknown | - | - | Goffery, James | --NR-- |
| 'Iszat U Doc' | Med-Green | - | - | Hybrid | Light-Purple | July into August | Benedict, Dr R. (Herb) & Walek, Kevin | .2009 |
| 'It' | Med-Green | Streaked | Speckles | Nat-Sport | Med-Lavender | July into August | Solberg, Robert | --NR-- |
| 'Itasca' | Med-Green | Streaked | Yellow | Nat-Sport | Pale-Lavender | July into August | Johnson, Arthur H. | .1974 |
| 'Iva Delight' | Med-Green | Medial | White | Nat-Sport | Pale-Lavender | July into August | Lisik, Philip | .2003 |
| 'Ivanhoe' | Med-Green | Marginal | White | Hybrid | - | - | Beilstein, Doug & Malloy, Alex | --NR-- |
| 'Ivory Necklace' | Med-Green | Marginal | White | TC Sport | Light-Purple | July | Zilis, Mark | .2003 |
| 'Ivory Queen' | Blue/Green | Medial | White | Nat-Sport | Med-Lavender | August to September | Walters Gardens | .2014 |
| 'Ivory Queen Streaked' | Blue/Green | Streaked | White | Nat-Sport | Med-Lavender | August to September | Unknown | --NR-- |
| 'Ivy Parody' | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | Braun-Nauerz, Gaby & Warmerdam, Piet | .2003 |
| 'Iwa Yara Moto' | Dark-Green | - | - | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
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