| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Salsa' | Large | Blue/Green | Medial | Speckles | Sport | Pale-Lavender | August | Roozekrans, Andi | .2002 |
| 'Savory Truffle' | Large | Dark-Green | Medial | White | Unknown | | | White, Jeff | --NR-- |
| 'Say Cheese' | Large | Yellow | | | Unknown | | | Purvis, Owen & Pruvis, Sue | --NR-- |
| 'Scallion Pancakes' | Medium | Med-Green | - | - | Unknown | - | - | Scheer, Alttara | --NR-- |
| 'Scalloped Potatoes' | Medium | Med-Green | - | - | Hybrid | - | - | Goodenough, Rick | --NR-- |
| 'Sea Biscuit' | Medium | Dark-Green | - | - | Unknown | Med-Lavender | June into July | Seaver, Mildred | --NR-- |
| 'Sea Salt' | Large | Blue/Green | | | Unknown | | | Smith, Roger | --NR-- |
| 'Seven Up' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Sheet Cake' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Slice of Pie' | - | Dark-Green | Medial | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Slim Jim' | Medium | Dark-Green | - | - | Unknown | Pale-Lavender | - | Wade, Van | --NR-- |
| 'Slurpee' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Slurpy' | Medium | Med-Green | - | - | Unknown | Light-Purple | July into August | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Smoothie' | Large | Med-Green | - | - | Hybrid | Med-Lavender | August to September | Banyai, Pauline & Banyai, Bruce | .1999 |
| 'Snap Crackle Pop' | Small | Blue/Green | - | - | Unknown | - | - | Aden, Paul | --NR-- |
| 'Sno Cone' | Small | Light-Green | Medial | White | Sport | Pale-Lavender | July | Solberg, Robert | .2009 |
| 'Snow Cream' | Medium | Med-Green | - | - | Hybrid | Pure-White | August | Lewis, Alan & Summers, Alex | --NR-- |
| 'Snowberry Muffin' | Medium | Med-Green | Medial | White | Unknown | | | Van den Top, Jan | --NR-- |
| 'Sorbet' | Medium | Med-Green | Marginal | White | Nat-Sport | Med-Lavender | July into August | Heemskerk, Gerardus | .2021 |
| 'Soup Spoon' | Large | Dark-Green | Marginal | Yellow | Unknown | - | - | Williams, Glenn | --NR-- |
| 'Southern Comfort' | Medium | Med-Green | - | - | Unknown | Light-Purple | August to October | Ruh, Peter | .1992 |
| 'Sparkling Burgundy' | Medium | Med-Green | - | - | Hybrid | Light-Purple | August | Savory, Robert | .1982 |
| 'Spearmint' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Spearmint Patty' | Large | Blue/Green | - | - | Unknown | - | - | Meyer, Bill | --NR-- |
| 'Special Blend' | Medium | Blue/Green | Streaked | Yellow | Unknown | Pale-Lavender | July | Van Eechaute, Danny | .2010 |
| 'Spiked Punch' | Medium | Med-Green | Streaked | Yellow | Sport | - | - | Walters Gardens | .2012 |
| 'Spilt Milk' | Large | Blue/Green | Streaked | Speckles | Unknown | Near-White | June into July | Seaver, Mildred | .1999 |
| 'Spinach Patch' | Large | Med-Green | - | - | Hybrid | Light-Purple | - | Vaughn, Kevin & Walek, Kevin & The American Hosta Society | .2009 |
| 'Spinach Pie' | Large | Dark-Green | - | - | Sport | - | July into August | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Spinach Soufflé' | Large | Blue/Green | Marginal | Yellow | TC Sport | Pale-Lavender | July | Solberg, Robert | .2006 |
| 'Spring Luau' | Medium | Med-Green | - | - | Sport | Med-Lavender | August | Philips, Hugo & Van Eechaute, Danny | --NR-- |
| '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 |
| 'Squash Blossom' | Medium | Blue/Green | Marginal | Yellow | Unknown | - | June into July | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2005 |
| 'Squash Casserole' | Large | Yellow | Marginal | Blue-Green | Hybrid | Light-Purple | July | Avent, Tony | .1995 |
| 'Squash Edge' | Large | Blue/Green | Marginal | Yellow | TC Sport | Near-White | June | Ruh, Peter | .2001 |
| 'Squirt' | Miniature | Med-Green | Marginal | Yellow | Hybrid | Deep-Purple | July | Bisschop, Lynn | .2014 |
| 'Sri Lankan Spice' | - | - | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Stewball' | - | - | - | - | Hybrid | - | - | Goodenough, Rick | --NR-- |
| 'Stirfry' | Medium | Dark-Green | - | - | Hybrid | Light-Purple | July into August | Benedict, Dr Ralph (Herb) | .1990 |
| 'Strawberry Banana Smoothie' | Medium | Light-Green | - | - | Hybrid | - | July into August | Solberg, Robert | .2008 |
| 'Strawberry Banana Sundae' | - | - | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Strawberry Delight' | Medium | Med-Green | - | - | Hybrid | Light-Purple | September | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Strawberry Frappe' | | | | | Unknown | Pure-White | | Goodenough, Rick | --NR-- |
| 'Strawberry Parfait' | Large | Yellow | - | - | Hybrid | Pale-Lavender | August to October | Dean, Don | .2004 |
| 'Strawberry Ripple' | Large | Dark-Green | Streaked | White | Hybrid | Med-Lavender | June into July | Elslager, Ed | .2004 |
| 'Strawberry Sundae' | Large | Med-Green | Streaked | Yellow | Unknown | | | Unknown | --NR-- |
| 'Strawberry Surprise' | Medium | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | Dean, Don | .2008 |
| 'Strawberry Swirls' | Medium | Med-Green | Streaked | White | Unknown | - | - | Soules, Marjorie | --NR-- |
| 'Strawberry Yogurt' | Small | Blue/Green | - | - | Hybrid | Light-Purple | August | Zilis, Mark | .2009 |
| 'Sublime Lime' | Medium | Light-Green | - | - | Unknown | - | June into July | Kruer, George | .2009 |
| 'Sugar and Cream' | Large | Med-Green | Marginal | Creamy White | TC Sport | Pure-White | August | Zilis, Mark | .1984 |
| 'Sugar and Spice' | Large | Dark-Green | Marginal | Yellow | TC Sport | Pale-Lavender | August | Zilis, Mark | .2003 |
| 'Sugar Babe' | Medium | Dark-Green | Marginal | White | Hybrid | Light-Purple | August | Solberg, Robert | .1996 |
| 'Sugar Blue' | Medium | Blue/Green | | | Unknown | Med-Lavender | | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Sugar Daddy' (Zilis) | Large | Blue/Green | Marginal | Yellow | TC Sport | Near-White | June | Zilis, Mark | .2003 |
| 'Sugar Mama' | Medium | Blue/Green | Medial | White | TC Sport | Near-White | June into July | Zilis, Mark | .2004 |
| 'Sugar Pie' | Small | Med-Green | Marginal | White | Sport | Med-Lavender | August | Snyder, Ron | .1998 |
| 'Sugar Plum' | Large | Med-Green | - | - | Hybrid | Light-Purple | August to September | Solberg, Robert | .2011 |
| 'Sugar Snap' | Large | Blue/Green | Marginal | Green | Sport | Pure-White | July into August | Solberg, Robert | .2011 |
| 'Sum Cup-o-Joe' | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | June into July | Elslager, Ed | .2000 |
| 'Sum Whopper' | Large | Dark-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Sun Kissed' | Medium | Light-Green | Marginal | White | Sport | Pure-White | July | Solberg, Robert | .2003 |
| 'Sundae Mix' | Small | Med-Green | Streaked | White | Sport | Med-Lavender | August to September | Philips, Hugo | --NR-- |
| 'Sunfish Bett' | Large | Light-Green | Marginal | Green | Sport | Pale-Lavender | July | Sauve, Criste | .2004 |
| 'Sunfish Blue' | Giant | Blue/Green | - | - | Unknown | - | July into August | Sauve, Criste | .2004 |
| 'Sunny Delight' | Medium | Light-Green | - | - | Hybrid | Light-Purple | July into August | Solberg, Robert | .2000 |
| 'Sunny Side Up' | Small | Yellow | - | - | Hybrid | Pale-Lavender | July into August | Avent, Tony | .2007 |
| 'Sunnyside Up' | Medium | Yellow | | | Unknown | | | Carlson, Monty & Carlson, Julie | --NR-- |
| 'Surf and Turf' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .1999 |
| 'Sweet and Low' | Miniature | Blue/Green | Streaked | Yellow | Hybrid | Pale-Lavender | July into August | Elslager, Ed | .2004 |
| 'Sweet and Sour' | Large | Med-Green | Streaked | Yellow | Sport | Near-White | August to September | Van den Top, Jan & Van Eechaute, Danny | .2008 |
| 'Sweet Tater Pie' | Medium | Yellow | - | - | Hybrid | - | - | Avent, Tony | .1995 |
| 'Swizzle Sticks' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | August | Herold, Roy & Walek, Kevin & The American Hosta Society | .2009 |
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