| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'Hammered Gold' | Medium | Hybrid | Near-White | July into August | Rawson, Don | .2016 |
| 'Hampshire Farms Going Green' | Medium | TC Sport | - | July into August | Zilis, Mark | .2009 |
| 'Hanja's Red Lines' | Medium | Hybrid | - | - | Hansen, Jan Hurup | --NR-- |
| 'Hannah Hanson' | Small | Unknown | - | June into July | Brodeur, Ernie & Ruh, Peter | .1997 |
| 'HarkAway's Mini Gold' | Miniature | Unknown | Near-White | June into July | HarkAway Botanicals & Courtice, Lyle | .2011 |
| 'Harriette Ward' | Giant | Hybrid | Pale-Lavender | June | Levy, Max & Levy, Melissa | .2000 |
| 'Hart's Tongue' | Miniature | Hybrid | Light-Purple | August | Kuk, Bob | .1987 |
| 'Harvest Glow' | Large | Sport | Near-White | July into August | Walters Gardens | .1988 |
| 'Have a Heart' | Miniature | Hybrid | - | - | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Hawkin's Gold' | Small | Hybrid | Pale-Lavender | July | Kwick, Charles | .2019 |
| 'Hazel' | Small | Unknown | Light-Purple | July | Stone, David & Ruh, Peter | .1987 |
| 'Heart Broken' | Small | TC Sport | Light-Purple | July | Zilis, Mark | .2002 |
| 'Heart of Gold' | Large | Hybrid | Light-Purple | August to October | Dishon, Jim | .1996 |
| 'Heart Strings' | Medium | Hybrid | Near-White | July into August | Beikmann, Stan | .2016 |
| 'Heartache' | Large | Hybrid | Light-Purple | July into August | Benedict, Dr Ralph (Herb) & Walek, Kevin | .2009 |
| 'Hedgehog' | Medium | Unknown | - | - | Plater-Zyberk, Maria | --NR-- |
| 'Heinz's Little Gold' | Small | Unknown | - | - | Heinz, David | --NR-- |
| 'Hello Gorgeous' | Large | Unknown | Near-White | July into August | Purvis, Owen | .2019 |
| 'Here's the Beef' | Large | Unknown | - | - | Ziarek, Ken | --NR-- |
| 'Herman's Pride' | Giant | Hybrid | Pale-Lavender | July | Kuk, Bob | .2005 |
| 'High Fidelity' | Large | Hybrid | Pale-Lavender | June into July | Gilligan, Madelon | .2013 |
| 'High Noon' | Large | Unknown | Pale-Lavender | June into July | Seaver, Mildred | .2004 |
| 'High Pockets Gold' | Medium | Hybrid | - | - | Zumbar, Wm | --NR-- |
| 'High Style' | Large | Hybrid | Pale-Lavender | July | Benedict, Dr Ralph (Herb) | .1984 |
| 'Hillside Spotlight' | Large | Unknown | - | - | Unknown | --NR-- |
| 'Hime Ogon Iwa' | Medium | Unknown | Med-Lavender | July into August | Ruh, Peter | .2002 .2018 |
| 'Hobby Time' | Large | Hybrid | - | June into July | Solberg, Robert | .2016 |
| 'Hokey Pokey' | Large | Hybrid | Pale-Lavender | June into July | Dawber, Robert & Gilligan, Madelon | .2013 |
| 'Holar Banana Moon' | Medium | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holar Early Days' | Medium | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holar High Waves' | Medium | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holar Purple Highness' | Medium | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holar Rising Flame' | Large | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holar Sunset Python' | Medium | Hybrid | - | - | Van Keer, Ronny | --NR-- |
| 'Holly's Gold' | Large | Hybrid | Light-Purple | July | Benedict, Dr Ralph (Herb) | .1991 |
| 'Honey Bee' | Medium | Hybrid | Near-White | June into July | Wilson, Audra & Van Wyke, Trudy | --NR-- |
| 'Honey Brickle' | Small | Unknown | Near-White | June into July | Schulz, Ed | .2013 |
| 'Honey Hill Eureka' | Large | Unknown | Pale-Lavender | June into July | Erb, Marsha Axmear | .2003 |
| 'Honey Hill Sidewalk Chalk' | Giant | Unknown | Pale-Lavender | June into July | Erb, Marsha Axmear | .2003 |
| 'Honey Pie' | Medium | Hybrid | Pale-Lavender | July into August | Solberg, Robert | .2013 |
| 'Honker Gold' | Medium | Unknown | Near-White | June | Wade, Shirley | --NR-- |
| 'Hopi' | Large | Unknown | Near-White | June | Wade, Van | --NR-- |
| 'Hotel California' | Giant | Hybrid | Pure-White | June into July | Purvis, Owen & Purvis, Sue | .2019 |
| 'Hotshot' | Medium | Unknown | - | - | Wols, Dan | --NR-- |
| 'Hottsy Tottsy' | Medium | Unknown | Pale-Lavender | July | Hottovy, Les & Hottovy, Steve | .2004 |
| 'Hula Skirt' | Medium | Sport | Pale-Lavender | August to September | Zilis, Mark & Schwarz, Jim | .2015 |
| 'Hummingbird Wings' | Small | Hybrid | Pale-Lavender | July into August | Walek, Kevin | .1996 |
| 'Huron Gold' | Large | Hybrid | - | - | Unknown | --NR-- |
| 'Hydon Gleam' | Medium | Hybrid | Pale-Lavender | August | George, Arthur & Ruh, Peter | .1998 |
| 'Hydon Sunrise' | Small | Unknown | - | - | George, Arthur & Benedict, Dr Ralph (Herb) | --NR-- |
| 'Hydon Sunset' | Small | Hybrid | Deep-Purple | July | George, Arthur & British Hosta and Hemerocallis Society | .1988 |
| 'O'Harra' | Small | Unknown | Deep-Purple | July | O'Harra, Russ & Walek, Kevin | .2009 |
| 'O'Heartland Gold' | - | Unknown | - | - | O'Harra, Russ | --NR-- |
| 'Scarlet O'Hara' | Medium | Hybrid | Light-Purple | - | Syre-Herz, Ursula | .1996 |
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