| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'I'm My Kid's Mom' E. Elslager 2003 | R | | str,gr,y,w | | | 'Color Glory' hybrid |
| H. 'I'm so Blue' J. Schwarz 1999 | R | | bl | | | unknown |
| H. 'I'm So Pretty' Jim Schwarz 2003 | R | ML | gr,crgoe | | | 'Rosedale Genevieve' sport |
| H. 'Ice Age' T. Schmid 2002 | R | | w,dgre | | | unknown |
| H. 'Ice Age Trail' M. Zilis 2002/Wisconsin Hosta Society 2003 | R | M | str,bl,cr,w | | | 'Big Daddy' sport |
| H. 'Ice Castle' Hans Hansen.Hideko Gowen 2006 | R | | crw,dgre | | | 'Edge of Night' sport |
| H. 'Ice Cream' Richard Rossing 1998 | R | S | dgr,ye | | | 'Vanilla Cream' sport |
| H. 'Ice Palace' D. & J. Ward 2003 | R | | blgr | | | 'Buckeye Blue' hybrid |
| H. 'Iceberg' Tony Avent 2000 | R | | gr,cre | | | 'Swoosh' x tibae |
| H. 'Iced Lemon' H. Batten/A. & R. Bowden/P. & J. Ruh 2005 | R | S | lgr,nawe | | | 'Lemon Delight' sport |
| H. 'Ichi-ban' Y. Hirose/M. Zilis/A. Malloy 2003 | R | D | w,gre | | | (('Swoosh' x venusta) x venusta) sport |
| H. 'Illicit Affair' Winterberry Farms/J. Anderson 2003 | R | S | gr,ye | | | 'Cheatin Heart' sport |
| H. 'Immense' Lucy Simpers/Peter Ruh 1991 | R | L | gr | | | montana x "Ibaraki-K" |
| H. 'Imp' Hans Hansen 2006 | R | D | dgr,crwe | | | (('Yellow Splash' x tibae) x venusta) x (venusta x 'Shining Tot') |
| H. 'Imperial Majesty' V. Sellers/M. Zilis/P. & J. Ruh 2003 | R | | gr | | | 'Hirao Majesty' x 'Hirao Supreme' |
| H. 'Imperial Moth' Mildred Seaver 2004 | R | M | gr,str,gry,cr | | | unknown |
| H. 'Imperial Potentate' R. & D. Benedict 1999 | R | | gr,str,w,y | | | 'Crowned Imperial' sport |
| H. 'In the Chips' P. Bennerup/A. Malloy 2000 | R | | blgr,we | | | 'Lucy Vitols' sport |
| H. 'Inaho' Japan/P. & J. Ruh 2005 | R | S | str,gr,y,gre | | | unknown |
| H. 'Inca Sun' G. Goodwin 2000 | R | | goy | | | unknown |
| H. 'Incognito' W. G. Struhar 2006 | R | | gr,goye | | | 'Elatior' sport |
| H. 'Incoming' E. & J. Deckert 2004 | R | L | dgr | | Y | unknown |
| H. 'Incredible Hunk' E. Elslager 1998 | R | | | | | unknown |
| H. 'Independence' Walters Gardens 2001 | R | | dgr,lye | | | 'Revolution' sport |
| H. 'Independence Day' Van Wade 1998 | R | L | gr,ncre | | | 'Gold Regal' sport |
| H. 'Indian Feather' Clarence Owens 1992 | R | S | w,dgre | | | 'Yellow Splash' selfed |
| H. 'Indian Hills' Dennis P. Savory 1989 | R | M | dgr | | | 'Black Hills' hybrid |
| H. 'Indian Princess' G. Harshbarger/L. Stratton/P. Ruh 1998 | R | | blgr | | | sieboldiana hybrid |
| H. 'Indian Summer' Randy Goodwin 2006 | R | | goy,crwe | | | |
| H. 'Indiana Knight' G. Randall Goodwin 1990 | R | ML | gr,che | | | 'August Moon' sport |
| H. 'Indiana Moonshine' C. Harstad 1996 | R | ML | y>(yc,gre) | | | 'August Moon' sport |
| H. 'Indianapolis Blue' Van Wade 2007 | R | | blgr | | | 'Quilted Skies' selfed |
| H. 'Indigo' Robert P. Savory 1984 | R | S | blga | | | 'Halcyon' hybrid |
| H. 'Indy Finish Line' R. Whitmore/J. Butler/Indianapolis Hosta Society/R. Goodwin 2005 | R | | w,gre | | | (x 'Warwick Choice Splashed') sport |
| H. 'Indy Parade Lap' Randy Goodwin 2005 | R | | gr,crwe | | | "'Bravo' line seedling" sport |
| H. 'Indy Winner's Circle' Bill Dove/J. Butler/Indianapolis Hosta Society 2006 | R | | gry,gre | | | 'Bright Glow' sport |
| H. 'Inland Sea' H. Sugita/M. Zilis/P. Ruh 1998 | R | M | dgr | | | kiyosumiensis x pycnophylla |
| H. 'Inniswood' Inniswood Metro Gardens 1993 | R | ML | y,dgre | | | 'Sun Glow' sport |
| H. 'Innovation' E. Nesmith/P. Ruh 1996 | R | | dgr | | | unknown |
| H. 'Inspire Greatness' Bill Silvers 2006 | R | L | blgr,crwe | | | |
| H. 'Intrigue' Paul Aden 1978 | R | M | str | | | 'Flamboyant' x 'High Fat Cream' |
| H. 'Invincible' Paul Aden 1986 | R | SM | gr | | Y | 'Aden 314' x 'Aden 802' |
| H. 'Iona' Lavender/Chappell/BHHS 1988 | R | M | blgr,we | | | 'Fortunei' sport |
| H. 'Iowa Hawkeye' J. & L. McBurney/Rod Kuenster 2006 | R | | y,dgre | | | 'Wolverine' sport |
| H. 'Iowa Moon' R. Simmering 2000 | R | | y,gre | | | 'August Moon' sport |
| H. 'Iris Frazier' Bob Solberg 2006 | R | | y,gre | | | 'Five O'Clock Somewhere' sport |
| H. 'Irische See' Heinz Klose 1987/P. Ruh 1998 | R | | blgr | | | tardiflora x sieboldiana 'Elegans' |
| H. 'Irish Eyes' Dick & Jane Ward 1999 | R | | gr,cre | | | 'Beatrice' x 'Reginald Kay' |
| H. 'Irish Hills' K. & L. Anderson 1996 | R | | dgr | | | 'Sum and Substance' sport |
| H. 'Irish Luck' I. LaLonde/Naylor Creek 2007 | R | | dgr | | Y | 'Invincible' seedling |
| H. 'Irish Mist' Robert P. Savory 1994 | R | S | w,dgre | | | 'Lancifolia' hybrid |
| H. 'Irish Moss' E. & J. Deckert 2004 | R | | | | | unknown |
| H. 'Irish Pastures' Randy Goodwin 2006 | R | | gry,crwe | | | |
| H. 'Irish Ribbons' Myrtle Kiehne/Ken Anderson 1992 | R | S | grwe,dgr | | | unknown |
| H. 'Irish Spring' Robert P. Savory 1985 | R | S | str,mot,y,gr | | | unknown |
| H. 'Iron Curtain' S. Asch 2000 | R | | blgr | | | 'Northern Halo' hybrid |
| H. 'Iron Gate Bouquet' Van M. Sellers 1983 | R | SM | gr | | Y | plantaginea x 'Tokudama Aureonebulosa' |
| H. 'Iron Gate Delight' Van M. Sellers 1981 | R | M | gr,(cr>w)e | | Y+ | plantaginea x 'Tokudama Aureonebulosa' |
| H. 'Iron Gate Glamour' Van M. Sellers 1981 | R | ML | gr,cre | | Y | plantaginea x 'Tokudama Aureonebulosa' |
| H. 'Iron Gate Supreme' Van M. Sellers 1980 | R | ML | str,gr,w | | Y | plantaginea x 'Tokudama Aureonebulosa' |
| H. 'Iroquois' Van Wade 2007 | R | | blgr | | | 'Blue Steel' x (x 'Dorothy Benedict') |
| H. 'Island Charm' G. Rasmussen/A. Malloy 1997 | R | SM | w,gre | PI | | 'Flamboyant' hybrid |
| H. 'Isle Royal' J.Wilkins/S. Wilkins 2000 | R | | dgr | | | 'Chartreuse Wedge' x "B" |
| H. 'It Rocks' Ed Elslager 2004 | R | | | | | 'Galaxy' seedling |
| H. 'Itasca' Arthur H. Johnson 1974 | R | S | str,w,blgre | | | 'Fortunei Hyacinthina' sport |
| H. 'Itsy Bitsy Spider' Greg Johnson 2004 | R | D | dgr | | | 'Hadspen Heron' seedling |
| H. 'Iva Delight' P. & G. Lisik 2003 | R | | w,gre | | | 'Fortunei Hyacinthina' sport |
| H. 'Ivory Coast' D. Savory 1999 | R | | lgr,(y>w)e | | | 'Sagae' sport |
| H. 'Ivory Necklace' M. Zilis 2003 | R | SM | gr,crwe | | | 'Emerald Necklace' sport |
| H. 'Ivory Pixie' Mildred Seaver 1982 | R | D | w,dgre | | | 'Allan P. McConnell' sport |
| H. 'Ivory Tower' Dick & Jane Ward 1996 | R | | yog | | | 'Sagae' hybrid |
| H. 'Ivy Parody' G. Braun-Nauerz/P. Warmerdam 2003 | R | | blgr,nacre | | | 'Wide Brim' sport |