| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'Faded Blue Jeans' | Medium | Unknown | - | - | Kuenster, Rod | --NR-- |
| 'Faerie Cups' | Large | Unknown | - | June into July | Brown, Sandy | .2010 |
| 'Fallen from Grace' | Medium | Unknown | - | - | Unknown | --NR-- |
| 'Fantastic' | Large | Hybrid | Near-White | June into July | Soules, Marjorie | .1988 |
| 'Farwell' | Small | Unknown | - | - | Minks, Eldren | --NR-- |
| 'Faux Bleu Pour Deux' | Medium | Hybrid | - | - | Schembs, Michael | --NR-- |
| 'Faux Karo' | Medium | Hybrid | - | - | Schembs, Michael | --NR-- |
| 'Feathervane' | Giant | Hybrid | Near-White | July into August | Groothuis, Mike | .2019 |
| 'Feel the Sky' | Small | TC Sport | Pale-Lavender | August | Van Eechaute, Danny | --NR-- |
| 'Feng Shui' | Medium | TC Sport | - | July into August | Zilis, Mark | .2009 |
| 'Fertile Phyllis' | Large | Unknown | Near-White | June into July | Asch, Stuart | .2010 |
| 'Field Rat' | Small | Sport | Light-Purple | June into July | Wilson, Chris | --NR-- |
| 'Flagship' | Medium | Hybrid | - | June into July | Prochaska, Richard | .2000 |
| 'Flame Off' | Medium | Sport | Light-Purple | August | Philips, Hugo & Lydell, Ran | --NR-- |
| 'Flanders Passion' | Large | Hybrid | - | July into August | Philips, Hugo | .2010 |
| 'Flash Dance' | Medium | Sport | Light-Purple | July | Malloy, Alex | .1999 |
| 'Fleet Week' | Large | Hybrid | Pale-Lavender | - | Scheer, Alttara | --NR-- |
| 'Fleeta's Blue' | Medium | Unknown | Near-White | June into July | Woodroffe, Fleeta Brownell & Ruh, Peter | .1999 |
| 'Flemish Sky' | Medium | Unknown | Pale-Lavender | August | Van Eechaute, Danny | .2004 |
| 'Flemish Steel' | - | Sport | - | - | Van Eechaute, Danny | .2010 |
| 'Florence Nightingale' | Large | Unknown | Med-Lavender | July | Goodenough, Rick | --NR-- |
| 'Flying Saucer' | Small | Unknown | Pale-Lavender | June into July | Solberg, Robert | .1996 |
| 'Fody' | Giant | Unknown | - | - | Unknown | --NR-- |
| 'Fond Farewell' | Large | Hybrid | Pure-White | June into July | Schulz, Ed | .2002 .2018 |
| 'Fond Hope' | Large | Hybrid | Near-White | June into July | Fisher, Eunice V. | .1973 |
| 'Forest Blues' | Medium | Unknown | - | - | Goodwin, Randy | --NR-- |
| 'Forest Canopy' | Large | Unknown | Near-White | July | Goodwin, Randy | .2009 |
| 'Forever Green' | Medium | Hybrid | Med-Lavender | August to October | Dishon, Jim | .1994 |
| 'Forgery' | Medium | Hybrid | Near-White | - | Nyikos, Frank | .2011 |
| 'Fortunei Hyacinthina' | Large | Sport | Pale-Lavender | July into August | Hylander, Nils & The American Hosta Society | .1987 |
| 'Fountain' | Giant | Hybrid | Near-White | June into July | Hensen, Karel | .1983 |
| 'Fountainhead' | - | Unknown | - | July into August | Shadrack, Kathy Guest | .2011 |
| 'Foxfire Boxcars' | Small | Sport | Med-Lavender | July into August | Schulte, Steve | --NR-- |
| 'Foxfire Irish Moon' | Large | Hybrid | Pale-Lavender | July | Schulte, Steve | .2003 |
| 'Foxfire Phantom' | Large | Hybrid | Near-White | July | Schulte, Steve | --NR-- |
| 'Fragrant Blue' | Large | Hybrid | Pale-Lavender | August | Vaughn, Kevin & Aden, Paul | .1988 |
| 'Fragrant Star' | Medium | Hybrid | Pure-White | August | Van den Top, Jan | --NR-- |
| 'Franc and Ed' | Large | Unknown | - | July into August | Schulz, Ed | .2015 |
| 'Frances Williams Baby' | Large | Hybrid | Near-White | June | Minks, Eldren | .1980 |
| 'Franc's Blueboy Lost' | Small | Unknown | - | June into July | Freeman, Franc & Freeman, Sally | .2010 |
| 'Franc's Mor Blue' | Medium | Unknown | - | June into July | Freeman, Franc & Freeman, Sally | .2010 |
| 'Frank Lloyd Wright | Giant | Unknown | Near-White | July | Goodenough, Rick | --NR-- |
| 'Frank's Rocket' | Giant | Unknown | Pure-White | June into July | Kruse, Francis & Kruse, C. | .1998 |
| 'Franz Radzicki' | Medium | Hybrid | - | July into August | Radzicki, Franz | .2009 |
| 'Free Spirit' | Large | Unknown | - | - | Unknown | --NR-- |
| 'Friends Forever' | Large | Unknown | Pure-White | July into August | King, Herb & King, Gladys | .2018 |
| 'Friesland' | Large | Unknown | - | - | Knopnadel, Uwe | --NR-- |
| 'Frilly Frolic' | Large | Hybrid | Pale-Lavender | July into August | Dean, Don | .2015 |
| 'Frisian Misty Sky' | Medium | Hybrid | Light-Purple | August to September | Aukema, Bate | --NR-- |
| 'Frisian Ruffles' | Medium | Hybrid | - | August to September | Aukema, Bate | --NR-- |
| 'Frisian Waving Steel' | Medium | Hybrid | Med-Lavender | - | Aukema, Bate | --NR-- |
| 'Fritzie' | Large | Hybrid | Pale-Lavender | June into July | Kwick, Charles | .2017 |
| 'Frost Bite' | Medium | Unknown | - | - | Kerr, Jeff | --NR-- |
| 'Frosty' | Large | Unknown | Near-White | June into July | Ross, Henry & Walek, Kevin | .2009 |
| 'Frosty Glen' | Large | Unknown | Light-Purple | - | Serafin, Viktoria | --NR-- |
| 'Fuchsia Frenzy' | Medium | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Fulda' | Medium | Unknown | Pale-Lavender | July into August | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2003 |
| 'Full Moon' | Medium | Hybrid | Pale-Lavender | July | Lachman, Wm & Lachman, Eleanor | .1991 |
| 'Fumiko' | Medium | Unknown | Med-Lavender | July | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2003 |
| 'Fuzzy Dice' | Medium | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .2009 |
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