| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'S.S. Geisha' | Medium | Med-Green | Streaked | Yellow | TC Sport | - | August to September | Owens, William & Owens, Jean & Sunrise Greenhouse | .2008 |
| 'Sagittarius' | Large | Light-Green | - | - | Hybrid | - | June into July | Husemann, Jim | .2009 |
| 'Saint Elmo's Fire' | Medium | Med-Green | Marginal | White | TC Sport | Pale-Lavender | July into August | Solberg, Robert | .1995 |
| 'Saketini' | Small | Yellow | - | - | Hybrid | Light-Purple | August to September | Zilis, Mark | .2009 |
| 'Sally Hoffman' | Small | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Ward, Jane | .2014 |
| 'Salty Blue' | Medium | Blue/Green | - | - | Hybrid | Pure-White | August | Nyikos, Frank | .2011 |
| 'Samurai' | Large | Blue/Green | Marginal | Yellow | Sport | Near-White | June into July | Unknown & Zilis, Mark | .2010 |
| 'Sandpaper' | Small | Blue/Green | - | - | Unknown | - | - | Brashear, Carol | --NR-- |
| 'Sandra' | Large | Dark-Green | Marginal | White | Unknown | - | July into August | Schwarz, Jim & Schwarz, Karen | .2015 |
| 'Sarah Fackey' | Medium | Med-Green | Marginal | Yellow | Unknown | - | June into July | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Sarah Kennedy' | Medium | Med-Green | Marginal | White | Sport | Light-Purple | August to October | Ford, Richard & Ford, Mary | .2004 |
| 'Sasquatch' | Large | Blue/Green | - | - | Unknown | Near-White | June into July | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Savannah' | Large | Med-Green | Marginal | White | Unknown | Pale-Lavender | August | Suggs, Natalee & Zilis, Mark | .1999 |
| 'Saw Mill' | Miniature | Light-Green | - | - | Hybrid | Pale-Lavender | July | Malloy, Alex | .1999 |
| 'Scalloped Potatoes' | Medium | Med-Green | - | - | Hybrid | - | - | Goodenough, Rick | --NR-- |
| 'Scally Cap' | Small | Med-Green | - | - | Unknown | - | August to September | Stadden, Josh | .2003 |
| 'Scarlet and Gray' | Medium | Dark-Green | - | - | Unknown | - | - | Ruh, Peter & Ruh, Jean | .2010 |
| 'Schwarzer Ritter' | Small | Dark-Green | - | - | Unknown | Light-Purple | - | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2008 |
| 'Scituate Harbormaster' | Large | Blue/Green | Streaked | Yellow | Unknown | - | - | Goodenough, Rick | --NR-- |
| 'Scoundrel' | Small | Med-Green | Marginal | White | Unknown | - | - | Goodwin, Randy | --NR-- |
| 'Sea Biscuit' | Medium | Dark-Green | - | - | Unknown | Med-Lavender | June into July | Seaver, Mildred | --NR-- |
| 'Sea Dragon' | Large | Dark-Green | - | - | Unknown | Near-White | June into July | Seaver, Mildred | --NR-- |
| 'Sea Mist' | Medium | Light-Green | Marginal | Green | Hybrid | Pale-Lavender | June into July | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Sea Nymph' | Medium | Dark-Green | Marginal | Yellow | Hybrid | Light-Purple | July | Seaver, Mildred | --NR-- |
| 'Sea Thunder' | Large | Dark-Green | Medial | White | Sport | Light-Purple | July into August | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Seiryu' | Medium | Med-Green | Streaked | White | Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Serapis' | Small | Med-Green | Marginal | White | Sport | Med-Lavender | July into August | Malloy, Alex | .2000 |
| 'Sergeant Pepper' | Medium | Blue/Green | Marginal | Yellow | Unknown | Pale-Lavender | August | Wasitis, Chick | .2001 |
| 'Serpentine' | Medium | Light-Green | - | - | Hybrid | Med-Lavender | July into August | Scheer, Alttara & Gilligan, Madelon | .2015 .2018 |
| 'Seto-no-Aki' | Medium | Dark-Green | - | - | Unknown | Near-White | September | Watanabe, Kenji & Ruh, Peter | .2002 |
| 'Setouchi Pycnophylla' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Setsurei' | Large | Blue/Green | - | - | Hybrid | - | August | Watanabe, Kenji | --NR-- |
| 'Shaboom Shaboom' | Large | Dark-Green | Streaked | Yellow | Unknown | - | - | Purvis, Owen & Purvis, Sue | --NR-- |
| 'Shade Beauty' | Large | Light-Green | Marginal | White | Unknown | Light-Purple | July into August | Aden, Paul | .1982 |
| 'Shade Finale' | Small | Med-Green | - | - | Sport | Pale-Lavender | July into August | Goodwin, Randy | .2005 |
| 'Shadow Wood Ruffles' | Medium | Yellow | - | - | Unknown | - | - | Goodwin, Randy | .2013 |
| 'Shady Lady' | Medium | Med-Green | Marginal | White | Unknown | - | - | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Shall We Dance' | Medium | Dark-Green | Streaked | Yellow | Sport | Med-Lavender | July into August | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Sharon Stone' | Medium | Blue/Green | Streaked | Yellow | Sport | Light-Purple | September | Van den Top, Jan | --NR-- |
| 'Sharon's Choice' | Small | Med-Green | Streaked | Yellow | Hybrid | - | July into August | Hicks, Gerry | .2014 |
| 'Sheaf of Grain' | Large | Med-Green | Medial | Yellow | Sport | Near-White | August to September | O'Brien, John | --NR-- |
| 'Sheila Macqueen' | Medium | Dark-Green | Streaked | Speckles | Unknown | Pale-Lavender | June into July | Bennerup, Pierre | .2000 |
| 'Shenanigans' | Medium | Dark-Green | Marginal | White | Unknown | Med-Lavender | July | Aden, Paul | --NR-- |
| 'She's Got the Moves' | Large | Med-Green | - | - | Hybrid | - | - | Philips, Hugo | --NR-- |
| 'Shirley Levy' | Medium | Dark-Green | Medial | Yellow | Unknown | Light-Purple | August | O'Harra, Russ | .1999 |
| 'Shirofukurin Hime Iwa' | Miniature | Dark-Green | Marginal | White | Sport | Pale-Lavender | September | Watanabe, Kenji & Ruh, Peter | .2001 |
| 'Shirofukurin Urajiro Iwa' | Small | Med-Green | Marginal | White | Sport | - | - | Unknown | --NR-- |
| 'Shoehorn' | - | Med-Green | - | - | Unknown | - | June into July | Freeman, Franc & Freeman, Sally | .2008 |
| 'Short Fat Fanny' | Small | Med-Green | Marginal | White | Hybrid | Light-Purple | July | Wasitis, Chick | --NR-- |
| 'Short Folks' | Small | Dark-Green | - | - | Unknown | - | - | Goodman, Jack | --NR-- |
| 'Short Pants' | Small | Dark-Green | Marginal | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Showtime' | Large | Med-Green | Marginal | White | Hybrid | Near-White | July | Aden, Paul | .1987 |
| 'Sight for Sore Eyes' | Small | Yellow | - | - | Hybrid | Pale-Lavender | July into August | Goodwin, Randy | .2013 |
| 'Silberpfeil' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | September | Klose, Heinz & Ruh, Peter & Ruh, Jean | .1990 |
| 'Silence is Golden' | Large | Yellow | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Silent Witness' | Medium | Med-Green | Marginal | Green | Hybrid | Deep-Purple | July | Malloy, Alex | .1997 |
| 'Silver Fox' | Small | Yellow | Marginal | Yellow | Sport | - | - | Unknown | --NR-- |
| 'Silver Light' | Small | Blue/Green | - | - | Hybrid | Pale-Lavender | July into August | Knoppert, Rene | .2013 |
| 'Silver Serenity' | Large | Blue/Green | - | - | Unknown | Med-Lavender | - | Livingston, Ron | --NR-- |
| 'Silver Splash' | Small | Dark-Green | Medial | White | Unknown | - | - | Snyder (Unknown) | --NR-- |
| 'Silver Twist' | Small | Blue/Green | - | - | Unknown | Pale-Lavender | - | Yinger, Barry | --NR-- |
| 'Sizzle' | Miniature | Med-Green | Medial | Yellow | Hybrid | Med-Lavender | - | King, Jim | --NR-- |
| 'Sizzler' | Large | Dark-Green | Streaked | Speckles | Hybrid | Pale-Lavender | July | Elslager, Ed | .2002 |
| 'Sky King' | Medium | Med-Green | - | - | Hybrid | Med-Lavender | July into August | Purvis, Owen & Purvis, Sue | .2009 |
| 'Sky Pilot' | Giant | Blue/Green | - | - | Sport | Med-Lavender | July | Green Mountain Hosta | --NR-- |
| 'Slammin' | Medium | Med-Green | Streaked | Yellow | Unknown | - | June into July | Zilis, Mark | .2010 |
| 'Slim Crinkles' | Medium | Med-Green | - | - | Hybrid | - | - | Fisher, Eunice V. | --NR-- |
| 'Slim Shady' | Small | Blue/Green | - | - | Sport | - | - | German, Ellen | --NR-- |
| 'Slurpy' | Medium | Med-Green | - | - | Unknown | Light-Purple | July into August | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Small Sum' | Large | Yellow | - | - | Hybrid | Pure-White | July | Goodwin, Randy | .1996 |
| 'Smash Hit' | Medium | Dark-Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Zilis, Mark | .2012 |
| 'Smoke Signals' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | July into August | Stegeman, Bev & Stegeman, Dave | .2008 |
| 'Smooth Sailing' | Large | Yellow | Marginal | Blue-Green | Hybrid | Med-Lavender | July | Elslager, Ed | .2002 |
| 'Snakeskin Boots' | Giant | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Hackbarth, Robert | .2015 |
| 'Sneak Peak' (Crabb) | Large | Med-Green | - | - | Sport | Med-Lavender | July into August | Crabb, Scott | --NR-- |
| 'Sneak Preview' | Small | Yellow | - | - | Hybrid | - | June into July | Ward, Dr Dick & Ward, Jane | .2010 |
| 'Snow Crust' | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | July into August | Zilis, Mark | .1985 |
| 'Snow Squall' | Large | Dark-Green | Medial | White | Sport | Pale-Lavender | July into August | O'Brien, John | --NR-- |
| 'Snowy Lake' | Medium | Blue/Green | Marginal | White | Sport | Pale-Lavender | June | Heims, Dan | --NR-- |
| 'So Nice' | Medium | Med-Green | Streaked | Yellow | Hybrid | Near-White | July | Ward, Dr Dick & Ward, Jane | .2015 |
| 'So Sweet' | Large | Med-Green | Marginal | Creamy White | Hybrid | Pale-Lavender | August | Vaughn, Kevin & Aden, Paul | .1986 |
| 'Soft Focus' | Large | Yellow | - | - | Unknown | Near-White | June into July | Asch, Stuart | .2009 |
| 'Soft Shoulders' | Medium | Med-Green | Marginal | White | Hybrid | Pale-Lavender | August | Avent, Tony | .1995 |
| 'Solar Eclipse' (Ward) | Medium | Med-Green | Marginal | White | Hybrid | Pure-White | July | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Solar Energy' | Medium | Yellow | Marginal | White | Sport | Pale-Lavender | July | Unknown | --NR-- |
| 'Solar Mouse' | Large | Dark-Green | - | - | Sport | - | August to September | Schwarz, Jim | .2015 |
| 'Solid Gold' | Medium | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Savory, Dennis | .2012 |
| 'Solo Flight' | Medium | Dark-Green | - | - | Hybrid | Med-Lavender | July | Cross, Peter | .2001 |
| 'Sombrero' | Large | Blue/Green | - | - | Hybrid | Pure-White | August | Savory, Robert | .1991 |
| 'Something for Sandra' | Large | Dark-Green | - | - | Hybrid | - | - | Livingston, Ron | --NR-- |
| 'Song Sung Blue' | Medium | Blue/Green | Marginal | Green | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2004 |
| 'Sophie' | Large | Dark-Green | - | - | Unknown | - | August to September | Schwarz, Jim | .2015 |
| 'Sophistication' | Large | Light-Green | Medial | White | Unknown | - | - | Aden, Paul | --NR-- |
| 'Soul Brother' | Small | Med-Green | - | - | Sport | Med-Lavender | July into August | Mortko, Rob | .2002 |
| 'Southern Music' | Medium | Dark-Green | Medial | White | Sport | Pale-Lavender | July | Harris, Robert | --NR-- |
| 'Sparkling Burgundy' | Medium | Med-Green | - | - | Hybrid | Light-Purple | August | Savory, Robert | .1982 |
| 'Spartan Arrow' | Small | Med-Green | - | - | Hybrid | Light-Purple | July | Goodwin, Randy | .2000 |
| 'Spartan Gem' | Medium | Med-Green | - | - | Unknown | Pale-Lavender | August to October | Banyai, Pauline | .1989 |
| 'Spartan Spear' | Medium | Med-Green | Marginal | White | Hybrid | Med-Lavender | August | Dean, Don | .2012 |
| 'Special Forces' | Medium | Blue/Green | Streaked | Yellow | TC Sport | Light-Purple | July | Zilis, Mark | .2011 |
| 'Spindrift' | Large | Dark-Green | Streaked | Yellow | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Spingarn's Japan' | Small | Dark-Green | - | - | Unknown | Light-Purple | July | Malloy, Alex | .2000 |
| 'Spitfire' | Medium | Dark-Green | Streaked | Speckles | Hybrid | Light-Purple | July | Malloy, Alex | .2002 |
| 'Sportcaster' | Medium | Med-Green | Marginal | Yellow | Hybrid | Pure-White | July | Elslager, Ed | .2004 |
| 'Spring Back' | Medium | Yellow | - | - | Sport | Pale-Lavender | July into August | Asch, Stuart | .2009 |
| 'Spring Break' | Medium | Light-Green | Marginal | White | Hybrid | Pale-Lavender | July into August | Asch, Stuart | .2000 |
| 'Spring Circle' | Large | Med-Green | Medial | Yellow | Sport | Pale-Lavender | August | Van den Top, Jan | --NR-- |
| 'Spring Ghost' | Medium | Blue/Green | Streaked | Yellow | Unknown | - | - | Van Eechaute, Danny | --NR-- |
| 'Spring Grove' | Giant | Med-Green | - | - | Unknown | Med-Lavender | July into August | Mack, Carl & Ruh, Peter & Ruh, Jean | .2002 |
| 'Sprite' | Medium | Dark-Green | Streaked | Yellow | TC Sport | - | July into August | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Spumoni' | Medium | Light-Green | Streaked | Yellow | Hybrid | Pale-Lavender | July | Elslager, Ed | .2004 |
| 'Spun Sulphur' | Medium | Yellow-Gold | - | - | Unknown | Pale-Lavender | July | O'Harra, Russ | .1986 |
| 'Squash Blossom' | Medium | Blue/Green | Marginal | Yellow | Unknown | - | June into July | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2005 |
| 'Squiggles' | Small | Med-Green | Medial | White | Hybrid | Pale-Lavender | July into August | Aden, Paul | .1978 |
| 'Squiggles Green' | Small | Med-Green | - | - | Sport | Med-Lavender | July | Wade, Van | --NR-- |
| 'St. Nicholas' | Medium | Med-Green | - | - | Unknown | Near-White | August to September | Zolock, Steve & Zolock, Sarah | .2007 |
| 'Stained Glass' | Large | Yellow | Medial | Green | TC Sport | Pale-Lavender | August | Hansen, Hans & Shady Oaks Nursery | .1999 |
| 'Stained Satin' | Medium | Dark-Green | Medial | Yellow | TC Sport | Light-Purple | July into August | Anderson, Jim | --NR-- |
| 'Stairway to Heaven' | Large | Med-Green | Marginal | White | Hybrid | Near-White | August to September | Kuenster, Rod | .2008 |
| 'Stand-up America' | Large | Dark-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2005 |
| 'Star Light Star Bright' | Medium | Med-Green | Marginal | Yellow | Hybrid | - | - | Terpening, Kent | --NR-- |
| 'Star Spangled Banner' | Large | Med-Green | Streaked | Yellow | Hybrid | Near-White | June into July | Elslager, Ed | .2002 |
| 'Stars and Stripes' | Medium | Dark-Green | Streaked | White | Hybrid | Pale-Lavender | June into July | Simmering, Ron | .2000 |
| 'Status Quo' | Medium | Blue/Green | Streaked | White | Hybrid | Pale-Lavender | June into July | de Rooij, Piet | .2013 |
| 'Staying the Course' | Medium | Med-Green | Medial | Yellow | TC Sport | Light-Purple | July | Anderson, Jim | --NR-- |
| 'Stealth' | Medium | Med-Green | Streaked | White | TC Sport | Med-Lavender | July into August | Anderson, Jim | --NR-- |
| 'Step Sister' | Medium | Light-Green | Marginal | Blue-Green | Sport | Near-White | June | Draheim, Gerald & Trucks, Gary | --NR-- |
| 'Stephen King' | Medium | Med-Green | - | - | Unknown | Light-Purple | June into July | Scheer, Alttara | --NR-- |
| 'Stiff Upper Lip' | Large | Blue/Green | - | - | Unknown | Med-Lavender | June into July | Asch, Stuart | .2010 |
| 'Stilbon' | Small | Blue/Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Stimulus Package' | Large | Med-Green | - | - | Unknown | - | July into August | Freeman, Franc | .2011 |
| 'Stone's Yellow Leaf' | Medium | Light-Green | - | - | Unknown | - | - | Stone, David & Ruh, Peter & Ruh, Jean | .2004 |
| 'Stormcloud' | Large | Dark-Green | - | - | Unknown | - | June into July | Kedl, Phyllis | .2010 |
| 'Strawberry Banana Smoothie' | Medium | Light-Green | - | - | Hybrid | - | July into August | Solberg, Robert | .2008 |
| 'Strawberry Parfait' | Large | Yellow | - | - | Hybrid | Pale-Lavender | August to October | Dean, Don | .2004 |
| 'Strawberry Surprise' | Medium | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | Dean, Don | .2008 |
| 'Strawberry Yogurt' | Small | Blue/Green | - | - | Hybrid | Light-Purple | August | Zilis, Mark | .2009 |
| 'Streaker Ahoy' | Giant | Dark-Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2004 |
| 'Streaker Heaven' | Large | Blue/Green | Streaked | Yellow | Hybrid | Med-Lavender | June into July | Kuenster, Rod | .2009 |
| 'Streakin in Ohio' | Medium | Light-Green | Streaked | Yellow | Unknown | - | - | Vasey, Mike | --NR-- |
| 'Strip Poker' | Large | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Burlingame, Nancy | .2004 |
| 'Striped Canvas' | Medium | Med-Green | Streaked | White | Hybrid | Deep-Purple | July into August | Seaver, Charles | .1996 |
| 'Striped Weasel' | Medium | Blue/Green | Streaked | White | Sport | Light-Purple | August | Van den Top, Jan & Van Eechaute, Danny | --NR-- |
| 'Stripper' | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | July into August | Klinkhamer, Luc & Van Eechaute, Danny | .2002 |
| 'Striptease Streaker' | Large | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | July into August | Jennings, Dave | --NR-- |
| 'Struttin' Stuff' | Large | Dark-Green | Marginal | Yellow | Unknown | - | - | Mora, Pat | --NR-- |
| 'Sublime Lime' | Medium | Light-Green | - | - | Unknown | - | June into July | Kruer, George | .2009 |
| 'Subterranean Pool' | Medium | Blue/Green | - | - | Hybrid | Med-Lavender | August to September | Dean, Don | .1999 |
| 'Sugar and Cream' | Large | Med-Green | Marginal | Creamy White | TC Sport | Pure-White | August | Zilis, Mark | .1984 |
| 'Sugar Babe' | Medium | Dark-Green | Marginal | White | Hybrid | Light-Purple | August | Solberg, Robert | .1996 |
| 'Sum and Subtle' | Large | Light-Green | Marginal | Green | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .2009 |
| 'Sum Thing Else' | Large | Dark-Green | - | - | Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Summer Concerto' | Medium | Light-Green | Medial | White | Sport | Pale-Lavender | July | Ziarek, Ken | --NR-- |
| 'Summer Fest' | Medium | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | July | Unknown | --NR-- |
| 'Summer Fragrance' | Large | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July into August | Vaughn, Kevin | .1983 |
| 'Summer Love' | Medium | Yellow | - | - | Sport | Pale-Lavender | June into July | Zilis, Mark | .2010 |
| 'Summer Music Supreme' | Medium | Med-Green | Streaked | White | Sport | Pale-Lavender | July | Stark, Gunther | --NR-- |
| 'Summer Serenade' | Large | Yellow | Marginal | Dark Green | Sport | Near-White | June | Klehm, Roy | .1998 |
| 'Summer Showcase' | Large | Light-Green | Marginal | Yellow | Unknown | - | - | Goodwin, Randy | .2009 |
| 'Summer Wind' | Large | Dark-Green | Marginal | White | Hybrid | Med-Lavender | July into August | Dalton, Jim & Dalton, Meg | .2012 |
| 'Sumsational' | Large | Dark-Green | Medial | Yellow | Sport | Med-Lavender | July into August | Zilis, Mark | .2010 |
| 'Sun Catcher' | Medium | Med-Green | - | - | Hybrid | Light-Purple | July into August | Banyai, Pauline | .2004 |
| 'Sun Safari' | Large | Yellow | - | - | Unknown | Pale-Lavender | - | Goodwin, Randy | .2014 |
| 'Sundance' | Large | Dark-Green | Marginal | White | TC Sport | Pale-Lavender | - | Walters Gardens | .1984 |
| 'Sunday Morning' | Medium | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Dalton, Jim & Dalton, Meg | .2012 |
| 'SUNHOSTA | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | August | Chodyla, Bernard | --NR-- |
| 'Sunlight and Shadows' | Medium | Med-Green | Streaked | Yellow | Sport | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Sunlight Sister' | Large | Light-Green | - | - | Unknown | Near-White | June | Nesmith, Elizabeth & The American Hosta Society | .1986 |
| 'Sunny Delight' | Medium | Light-Green | - | - | Hybrid | Light-Purple | July into August | Solberg, Robert | .2000 |
| 'Sunrise Serenade' | Giant | Light-Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Sun's Glory' | Giant | Med-Green | - | - | Sport | Med-Lavender | July | Vaughn, Kevin | --NR-- |
| 'Super Hero' | Medium | Dark-Green | Marginal | White | Hybrid | - | July into August | Tylinski, Stan & Malloy, Alex | .2005 |
| 'Super Sagae' | Large | Dark-Green | Marginal | White | Sport | Pale-Lavender | July into August | Dautzenberg, Theo & Dautzenberg, Marie-José | --NR-- |
| 'Surrender' | Medium | Med-Green | Marginal | White | Unknown | - | July into August | Goodwin, Randy | .2005 |
| 'Susquehanna River' | Small | Med-Green | Marginal | White | Hybrid | - | - | Beilstein, Doug & Malloy, Alex | --NR-- |
| 'Susy' | Medium | Med-Green | - | - | Unknown | Light-Purple | August | Harrison, Dr Jamison & The American Hosta Society | .1986 |
| 'Suzy Merle' | Giant | Dark-Green | - | - | Unknown | Pale-Lavender | June into July | Simpers, Lucille | --NR-- |
| 'Suzy Q' | Large | Med-Green | - | - | Hybrid | Light-Purple | August to September | Lohman, Doug & Zilis, Mark | .2009 |
| 'Sweet and Sour' | Large | Med-Green | Streaked | Yellow | Sport | Near-White | August to September | Van den Top, Jan & Van Eechaute, Danny | .2008 |
| 'Sweet Home Chicago' | Medium | Yellow | Marginal | Blue-Green | TC Sport | Pale-Lavender | July | Ruh, Peter | .2002 |
| 'Sweet Serenity' | Large | Med-Green | Marginal | Yellow | TC Sport | Pale-Lavender | August | Zilis, Mark | .1990 |
| 'Sweet Susan' | Large | Med-Green | - | - | Hybrid | Pale-Lavender | August | Williams, Frances & Williams, Connie | .1986 |
| 'Sweet Tater Pie' | Medium | Yellow | - | - | Hybrid | - | - | Avent, Tony | .1995 |
| 'Sweet Thing' | Medium | Dark-Green | Marginal | White | Sport | Near-White | July into August | Sebright Gardens | .2004 |
| 'Sweet William' | Large | Dark-Green | Streaked | White | Hybrid | Med-Lavender | July | Asch, Stuart | .2004 |
| 'Sweetness' (Zilis) | Large | Med-Green | - | - | TC Sport | Pale-Lavender | August to September | Zilis, Mark | .2003 |
| 'Sycamore Creek' | Large | Dark-Green | Streaked | White | Hybrid | - | - | Moore, Jeff | --NR-- |
| 'Sydney' | Small | Med-Green | Marginal | Yellow | Hybrid | Near-White | - | Graves, Butch | .2009 |
| 'Synergy' | Medium | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Zilis, Mark | .2012 |
|