| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'T Rex' Dick & Jane Ward 1999 | R | | | | | |
| H. 'Table Six' D. Grande 2003 | R | | blgr,we | | | "'Frances Williams' seedling" sport |
| H. 'Taffeta' Russ O'Harra 1991 | R | SM | dgr | | | ventricosa 'Aureomarginata' selfed |
| H. 'Tall Boy' Le Jardin de Botanique de Montreal 1983 | R | ML | gr | | | rectifolia sport or hybrid |
| H. 'Tall Twister' Eldren W. Minks 1973 | R | SM | gr | | | unknown |
| H. 'Tambourine' William & Eleanor Lachman 1987 | R | SM | blgr,cre | R | | 'Resonance' hybrid |
| H. 'Tangerine' Ed Elslager 1998 | R | | goy | G | | 'Sea Sunrise' hybrid |
| H. 'Tango' G. Heemskerk 2005 | R | | dgr,crwe | | | 'Pastures New' sport |
| H. 'Tappen Zee' Alex Malloy 2004 | R | | | | | 'Electrum Stater' sport |
| H. 'Tara' G. Goodwin 2000 | R | M | blgr,cre | | | 'Sea Prize' hybrid |
| H. 'Tardiflora Hybrida' Georg Arends 1911/Peter Ruh 1992 | R | S | dgr | | | 'Tardiflora' x ventricosa |
| H. 'Tarnished' Kevin C. Vaughn 1987 | R | S | str | | | |
| H. 'Tassels' R. Whitmore 2002 | R | | str,gr,w | | | 'Striptease' sport |
| H. 'Tatted Lace' Fairway Enterprises 1990 | R | S | gr | | | |
| H. 'Tattletale Gray' Chet Tompkins/P. Ruh 2000 | R | L | blgr | | | unknown |
| H. 'Tattoo' Tony Avent 1998 | R | DS | goy,lgre,grwat | | | 'Little Aurora' sport |
| H. 'Teacher's Pet' Stuart Asch 2000 | R | | blgr,cre | | | 'Dorothy Benedict' x montana |
| H. 'Tears of Joy' P. Black & T. Johnson/Sebright Gardens 2005 | R | | gr | | | 'Tiny Tears' sport |
| H. 'Teaspoon' F. Nyikos 1998 | R | S | gr | | | 'Birchwood Parky's Gold' x 'Golden Tiara' |
| H. 'Teatime' M.Zilis/J. Boyden 2006 | R | | dgr,goye | | | 'English Sunrise' sport |
| H. 'Technicolor' Ed Elslager 2005 | R | | | | | |
| H. 'Teeny-bopper' E. Elslager 2001 | R | D | str,gr,y | | | 'Sea Prize' hybrid |
| H. 'Teeny-weeny Bikini' Ed Elslager 2000 | R | D | ly,gre | STR | | 'Tsugari Komachi' selfed |
| H. 'Telly's Treasure' M. Singer/E. Elslager 2002 | R | | str,dgr,gr,y | PU | | unknown |
| H. 'Templar Gold' E. & J. Deckert 2004 | R | | | | | unknown |
| H. 'Temple Bells' Pauline Banyai 1992 | R | S | dgr | | | (x 'Beatrice') hybrid |
| H. 'Temple Great' Jernigan 1986 | R | L | bl | | | |
| H. 'Tenryu' S. Yoshie 1985/P. Ruh 2002 | R | L | blgr | | | Tenryu valley, Japan |
| H. 'Tentacles' Charles R. Seaver 1996 | R | S | | R | | 'Don Stevens' x 'Sea Octopus' |
| H. 'Tequila Sunrise' Greg Johnson 2004 | R | | go>ch | RD | | 'Spritzer' x pycnophylla |
| H. 'Terminator' Ed Elslager 2003 | R | | str,blgr,y,cr | | | "streaked 'Loch Ness' seedling" hybrid |
| H. 'Terra Marie' Van Wade 2007 | R | | goy>gry | | | 'Stitchery' x 'Spritzer' |
| H. 'Terry' C. Owens 2002 | R | | gr,we | | | 'Sally and Bob' sport |
| H. 'Terry Wogan' Richard and Mary Ford 2006 | R | M | gry>blgr | | | 'June' sport |
| H. 'Thai Brass' Fleeta Brownell Woodroffe 1972 | R | L | y | | | unknown |
| H. 'Thank You' Tom Micheletti 2007 | R | | blgr | | | 'Fascination' x 'Sagae' |
| H. 'Thanksgiving' Ron Snyder 2000 | R | | gry,cre | | | 'Gold Regal' sport |
| H. 'The Godfather' Dick & Jane Ward 1998 | R | XL | dgr | | | unknown |
| H. 'The Green Hornet' Ed Elslager 2004 | R | | | | | (x 'Dorothy Benedict') selfed |
| H. 'The Hulk' P. Bennerup/Alex Malloy 1998 | R | | gr | | | unknown |
| H. 'The King' Jim Schwarz 2007 | R | | gr,crwe | | | unknown |
| H. 'The Leading Edge' E. Elslager 2002 | R | | gr,grye | | | (x 'Dorothy Benedict') selfed |
| H. 'The Mamas and the Papas' E. Elslager 2002 | R | | str,lgr,w,we | | | 'Foxy Doxy' x 'Maekawa' |
| H. 'The Perfect Storm' Arthur Wrede 2005 | R | | | | | 'Sailor's Warning' hybrid |
| H. 'The Queen' Jim Schwarz 2007 | R | | crw,gre | | | 'Sir Richard' sport |
| H. 'The Right Stuff' E. Elslager 2001 | R | | str,gr,y,w | | | 'Galaxy' x 'Incredible Hunk' |
| H. 'The Sun King' Russ O'Harra/Russ O'Harra Society 1999 | R | ML | goy | | | unknown |
| H. 'The Twister' Robert P. Savory/AHS 1986 | R | SM | gr | | | |
| H. 'Thea' Barcock/Netta Statham/Goldbrook Plants 1985 | R | M | str,blgr,cry | | | 'Fortunei Hyacinthina' sport |
| H. 'Thelma M. Pierson' Robert G. Pierson 1988 | R | L | y | | | (x 'Fortunei Hyacinthina') sport |
| H. 'Theodore Roosevelt' H. Sugita/M. Zilis/P. & J. Ruh 2001 | R | | ygr | | | unknown |
| H. 'These Colors Don't Run' E. Elslager 2002 | R | | str,gr,y | | | (x 'Dorothy Benedict') x 'Maekawa' |
| H. 'Thomas Jefferson' H. Sugita/P. Ruh/M. Zilis/P. & J. Ruh 2001 | R | L | ygo | | | unknown |
| H. 'Thor' Peter Ruh 1994 | R | L | gr | | | hypoleuca seedling |
| H. 'Three Coins' Leonard Jones 2000 | R | | gr,lye | | | 'Green Fountain' sport |
| H. 'Thumb Nail' Epstein/Paul Aden 1982 | R | DS | gr | | | venusta hybrid |
| H. 'Thumbelina' Dick Ward 1996 | R | S | gr,cre | | | 'Pin Stripe Sister' hybrid |
| H. 'Thumbs Up' Jim Schwarz 1999 | R | SM | gr,cre | | | 'Achy Breaky Heart' sport |
| H. 'Thunder Boomer' Bob Solberg 2007 | R | | blgr | | | (sieboldiana x 'One Man's Treasure') seedling |
| H. 'Tic Tac' G. Johnson 2004 | R | | | | | 'Little Wonder' seedling |
| H. 'Tickle Me Pink' B. & D. Stegeman 2006 | R | | goy | RBR | | 'One Man's Treasure' x 'Squash Casserole' |
| H. 'Tidal Pool' K. Dye 2002 | R | | gablgr | | | 'Great Expectations' hybrid |
| H. 'Tiddlywinks' Pauline Banyai 1989 | R | S | gr,we | | | |
| H. 'Tidewater' M. Zilis/ECGC Distributers 2003 | R | ML | blgr | | | kikutii f. leuconota x 'Elegans' |
| H. 'Tiffney's Darth Vader' J. Dreessen 1999 | R | | dgr | | | ventricosa sport |
| H. 'Tiffney's Godzilla' J. Dreessen 1996 | R | | gr,ye | | | 'Sum and Substance' sport |
| H. 'Tiffney's Gold Digger' J. Dreessen 1999 | R | | gry>goy | | | 'Sun Power' sport |
| H. 'Tigger' Ron Simmering 2000 | R | | str,gr,y | STR | | 'Color Fantasy' hybrid |
| H. 'Tijuana Brass' Kevin C. Vaughn 1988 | R | L | ch>y | | | 'Golden Waffles' x 'Polly Bishop' |
| H. 'Time Tunnel' M. Laviana/A. Malloy 2001 | R | | gr,(y>w)e | | | 'Frances Williams' sport |
| H. 'Timothy' D. Ruh/Peter Ruh 1998 | R | S | dgr,ye | | | 'Gold Edger' sport |
| H. 'Timothy C. Morgan' S. Chamberlain 2005 | R | | crw,blgre | | | "unnamed streaked seedling" sport |
| H. 'Tinker Bell' Frances Williams/Connie Williams 1986 | R | S | gr | | | |
| H. 'Tiny Tears' Robert Savory 1977 | R | D | gr | | | venusta hybrid |
| H. 'Tisch' Roland Tisch/Larry Englerth/Peter Ruh 2002 | R | ML | blgr | | | unknown |
| H. 'Titanic' H. Hansen 1999 | R | | gr,ye | | | 'Sum and Substance' sport |
| H. 'Titanium' Don Dean 2000 | R | | blgr | | | 'Urajiro Hachijo' x 'Blue Clown' |
| H. 'Tokudama Aureonebulosa' Maekawa/AHS 1987 | R | SM | (ch>y),blgre | | | |
| H. 'Tokudama Flavocircinalis' Maekawa/AHS 1987 | R | M | blgr,ye | | | |
| H. 'Tokudama Flavoplanata' Maekawa/AHS 1987 | R | M | yc | | | |
| H. 'Tom Gannon' S. & S. Zolock 2005 | R | | gr,str,ly | | | 'Christmas Tree' hybrid |
| H. 'Tom Rex' D. & J. Ward 1999 | R | XL | gr | | | montana f. macrophylla x 'Big John' |
| H. 'Tom Schmid' Tom Schmid 1995 | R | L | (bl>gr),we | | | 'Krossa Regal' sport |
| H. 'Tom's Baby' J. Dishon/T. Schmid 2003 | R | | gry,str,y,cr | | | 'Sea Prize' x 'Love Pat' |
| H. 'Tom's Dream' Mark Zilis/Northern Illinois Hosta Society 2003 | R | S | str,gr,w | | | 'Joyce Trott' sport |
| H. 'Tomo Yuki' Kent Terpening 2005 | R | | gr,we | | | 'Mountain Snow' sport |
| H. 'Tomoko' Heinz Klose 1991/P. & J. Ruh 2003 | R | ML | bl | | | tardiflora hybrid |
| H. 'Tonto' Alex Malloy 2002 | R | | dgr,crwe | R | | 'Red Ryder' sport |
| H. 'Toots' H. Sugita/J. Ruh/P. Ruh 1998 | R | | dgr | L | | pycnophylla x kiyosumiensis |
| H. 'Top Banana' Kevin C. Vaughn 1983 | R | M | str,w,blgre | | | 'Beatrice' x 'Frances Williams' |
| H. 'Top Hat and Tails' Ed Elslager 2005 | R | G | blgr,str,y,cr | | | (x 'Christmas Tree Gala') seedling |
| H. 'Top Number' Eunice V. Fisher 1971 | R | L | gr | | | |
| H. 'Topaz' Greg Johnson 2004 | R | ML | blgr | | | 'Neat Splash' x 'Dorset Blue' |
| H. 'Topaz Tiara' Walters Gardens 1998 | R | | y,gre | | | 'Grand Tiara' sport |
| H. 'Topsy-turvy' Ed Elslager 2000 | R | | str,gr,y,w | STR | | 'William Lachman' x hypoleuca |
| H. 'Torchlight' William & Eleanor Lachman 1990 | R | ML | blgr,we | R | | 'Lachman 81-8' x 'Halcyon' |
| H. 'Torchy' W. Zumbar 1995 | R | S | gr,we | | | unknown |
| H. 'Tornado Glenn' Rod Kuenster 2006 | R | | str,grw,gry | | | 'Swoosh' selfed |
| H. 'Tortifrons' Maekawa 1940/Schmid/AHS 2002 | R | D | dgr | | | 'Tardiflora' sport |
| H. 'Tortilla Chip' Bob Solberg/M. Zilis 2002 | R | | go | | Y | 'Stained Glass' sport |
| H. 'Tot Tot' Paul Aden 1978 | R | D | gr | | | 'Blue Cadet' x venusta |
| H. 'Totally Awe Sum' M. Koller 2003 | R | | lgr,w,grye | | | 'Sum and Substance' sport |
| H. 'Totally Wacky' J. Schwarz 2002 | R | M | gr | | | unknown |
| H. 'Touch of Class' H. Hansen/Shady Oaks Nursery 1999 | R | | chy,blgre | | | 'June' sport |
| H. 'Touch the Sky' E. Elslager 2001 | R | | dgr,grye | | | 'William Lachman' x 'Elatior' |
| H. 'Touché' Bob Solberg/Jim Schwarz 2005 | R | | gr,str,crw | | | 'Machete' sport |
| H. 'Tough Hombre' Ed Elslager 2003 | R | | gr,str,y | | | 'Galaxy' hybrid |
| H. 'Toutatis' E. & J. Deckert 2004 | R | | | | | unknown |
| H. 'Towering Inferno Remembered' E. Elslager 2001 | R | | str,gr,y,w | | | 'Galaxy' hybrid |
| H. 'Toy Soldier' R. Solberg 2000 | R | SM | blgr,cre | | | 'Blue Cadet' sport |
| H. 'Tracy's Emerald Cup' Tracy Heuermann 1997 | R | M | gr | | | 'Francee' hybrid |
| H. 'Trade Wind' John Kulpa 1994 | R | ML | str,dgr,w | | | 'Whirlwind' sport |
| H. 'Trafalgar Square' P. & J. Ruh 2005 | R | | dgr | RB | | unknown |
| H. 'Trail of Tears' M. Soules 1999 | R | | str,gr,y,ye | | | 'Regal Splendor' sport |
| H. 'Trail's End' Peter Ruh 1978 | R | XL | blga | | | |
| H. 'Trailblazer' M. Zilis 1999 | R | ML | dgr,we | | | 'Francee' sport |
| H. 'Tranquility' J. & J. Wilkins 1995 | R | M | blgr,ye | | | (x 'Aspen Gold') sport |
| H. 'Treasure' Gretchen Harshbarger 1981 | R | ML | y | | | 'Tokudama Aureonebulosa' hybrid |
| H. 'Treasure Island' Tony Avent 1998 | R | S | dgr | GR | | yingeri selection |
| H. 'Triple Ripple' E. Elslager 2005 | R | | blgr,grye | | | (x 'Dorothy Benedict') seedling |
| H. 'Triumph' A. Tower/Tower Perennial Gardens 2002 | R | L | gr,we | | | 'Color Fantasy' hybrid |
| H. 'Trixi' D. Dupré 2006 | R | | gr,crwe | | | unknown |
| H. 'Tropical Storm' Walters Gardens/Amy Bergeron 2007 | R | | gr,goye | | | 'Rainforest Sunrise' sport |
| H. 'True Blue' Paul Aden 1978 | R | L | blgr | | | 'Chartreuse Wedge' x (nigrescens x 'Blue Vision') |
| H. 'True Love' Paul Aden 1979 | R | ML | bl | | | 'Blue Vision' x 'True Blue' |
| H. 'Tucker Blues' Ray B. Stephens 1990 | R | L | bl | | | montana x 'Fortunei Aureomarginata' |
| H. 'Tucker Charm' Ray B. Stephens 1993 | R | S | dgr | | | 'Pearl Lake' x 'Herifu' |
| H. 'Tucker Friendly Folk' Ray B. Stephens 1991 | R | XL | dgr | | | (x 'Wolcott') x montana |
| H. 'Tucker Irish Heart' Ray B. Stephens 1993 | R | S | gr | | | 'Golden Prayers' sport |
| H. 'Tucker Pucker' Ray B. Stephens 1993 | R | L | blgr>dgr | | | (x montana) x 'Big Daddy' |
| H. 'Tucker Tigers' Ray B. Stephens 1993 | R | L | lgr | | | (x 'Wolcott') x 'Piedmont Gold' |
| H. 'Tucker Tiny Tot' R. Stephens 1995 | R | | dgr | | | (x 'Kabitan') x (x 'Herifu') |
| H. 'Tucker Tommy Little' Ray B. Stephens 1991 | R | XL | dgr | | | (x 'Wolcott') x montana |
| H. 'Tucker Top Cat' Ray B. Stephens 1993 | R | M | dgr,gre | | | (x 'Herifu') x 'Happy Hearts' |
| H. 'Tucker Valentine' Ray B. Stephens 1991 | R | L | dgr | | | 'Herifu' x ventricosa |
| H. 'Tucker Wave' R. Stephens 1995 | R | | dgr,lgre | | | 'Kabitan' x (x 'Neat Splash') |
| H. 'Tucker Welcome' Ray B. Stephens 1991 | R | XL | gr | | | |
| H. 'Tunisian Dream' Kent Terpening 2005 | R | | blgr | | | 'Azure Snow' hybrid |
| H. 'Turbo Blue' Ed Elslager 2004 | R | | | | | (x 'Dorothy Benedict') selfed |
| H. 'Turbulent Seas' Don Dean 1999 | R | | gr | | | 'Neat and Tidy' x 'Aspen Gold' |
| H. 'Turnabout' Ran Lydell 2001 | R | S | gr,ye | | | 'Turning Point' sport |
| H. 'Turner Junction' Mark Zilis 2003 | R | | blgr | | | 'Spinning Wheel' sport |
| H. 'Turtle Dove' Dennis P. Savory 2000 | R | D | blgr | | | 'Bells of Edinborough' x 'Indigo' |
| H. 'Tutti-frutti' Ed Elslager 2000 | R | | cr,ygre | | | 'Sea Prize' x 'Maekawa' |
| H. 'Tweeny' Virginia Heller/Pauline Banyai 1989 | R | D | gr | | | unknown |
| H. 'Tweety Bird' Jim Schwarz 1997 | R | S | y | | | unknown |
| H. 'Twilight' G. Van Eijk-Bos/Van Buren/Van Erven 1997 | R | M | dgr,ye | GR | | 'Fortunei Aureomarginata' sport |
| H. 'Twilight Time' Greg Johnson 2004 | R | M | bl | | | 'Spritzer' seedling |
| H. 'Twilight Zone' A. Haskell/A. Malloy 1999 | R | M | gr,str,cr,y | | | 'Fortunei Hyacinthina' sport |
| H. 'Twinkle Toes' Eldren W. Minks 1973 | R | DS | y | | | |
| H. 'Twist and Shout' Kevin C. Vaughn 1988 | R | L | bl | | | 'Gold Piece' x (x 'Aztec Treasure') |
| H. 'Twist of Fate' Kevin Walek 2000 | R | | blgr | | | ventricosa hybrid |
| H. 'Twist of Lime' Bruce Banyai/Robert Solberg 1991 | R | DS | ch,dgre | | | 'Lemon Lime' sport |
| H. 'Two Step' Paul Aden 1987 | R | S | gr,ye | | | 'Embroidery' x 'Aden 341' |
| H. 'Tyler's Treasure' Charlie Isaac 1999 | R | ML | blgr,ye | | | 'Piedmont Gold' sport |
| H. 'Tyre' Alex Malloy 2005 | R | S | str,gr,w | GR | | 'Loleta Powell' seedling |