| Giant Size Hostas | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Gabriel's Wing' | Med-Green | Marginal | White | Nat-Sport | Pale-Lavender | June into July | Rawson, Don | .2016 |
| 'Gargantua' | Blue/Green | - | - | Unknown | - | - | Wade, Van | --NR-- |
| 'Gary Rivera' | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | Zolock, Steve & Sarah | .2006 |
| 'Gateway Arch' | Med-Green | - | - | Nat-Sport | Med-Lavender | July | St Louis Hosta Society | --NR-- |
| 'Gemini' | Dark-Green | Marginal | Green | Nat-Sport | Pale-Lavender | July | Husemann, Jim | .2012 |
| 'Gerrie's Gift' | Med-Green | Marginal | Yellow | Nat-Sport | Near-White | July into August | Frankenberger, J. & Van Ostrand, John | .2011 |
| 'Giantland Aftershock' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Banana Tree' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Believe in a Dream' | Yellow | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Big Bastard' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Blue Monday' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Blue Monster' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Butterfly Wings' | Blue/Green | Marginal | White | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Dawn’s Glow' | Yellow | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Gatorback' | Med-Green | Streaked | Yellow | Unknown | Near-White | June into July | Miller, Jeff | --NR-- |
| 'Giantland Golden Dome' | Light-Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Golden Goddess' | Yellow | - | - | Hybrid | - | - | Miller, Jeff | --NR-- |
| 'Giantland Halloween' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Indi Bowl' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Irish Mist' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Karma' | Blue/Green | Marginal | White | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Megalodon' | Med-Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Pac-Man' | Yellow | - | - | Hybrid | - | - | Miller, Jeff | --NR-- |
| 'Giantland Tantalize' | Dark-Green | Medial | Light Green | Nat-Sport | Near-White | June into July | Miller, Jeff | --NR-- |
| 'Giantland Thor' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Tsunami' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Wrinkled Shovel' | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Yellow Dome' | Yellow | - | - | Hybrid | - | - | Miller, Jeff | --NR-- |
| 'Ginryu' | Blue/Green | Marginal | White | TC Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Gitchigumi' | Blue/Green | - | - | Hybrid | Pure-White | July | Petryszyn, Olga | .2009 |
| 'Glen Eyeful Tower' | Med-Green | - | - | Hybrid | - | July | Serafin, Viktoria | .2009 |
| 'Glen Fetish' | Yellow | - | - | Hybrid | Med-Lavender | July into August | Serafin, Viktoria | .2008 |
| 'Glen Triumph' | Blue/Green | - | - | Hybrid | - | July into August | Serafin, Viktoria | .2008 |
| 'Glossy Glory' | Dark-Green | - | - | Hybrid | Pale-Lavender | July into August | Orlando, John | .2003 |
| 'Gold Pants' | Yellow-Gold | - | - | Hybrid | Pale-Lavender | July | Beilstein, Doug & Mardy | .2018 |
| 'Gold Piece' | Yellow | - | - | Hybrid | Light-Purple | July into August | Vaughn, Kevin | .1993 |
| 'Gold Regal' | Yellow | - | - | Hybrid | Med-Lavender | July | Aden, Paul & Unknown | .1974 |
| 'Golden Days' | Yellow-Gold | - | - | Nat-Sport | Pale-Lavender | July | Green Mountain Hosta | --NR-- |
| 'Golden Dove' | Yellow | - | - | Unknown | Med-Lavender | June into July | Dove, Bill & Wanda | .2006 |
| 'Golden Flame' | Yellow | - | - | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .1990 |
| 'Golden Sculpture' | Yellow | - | - | Unknown | Near-White | June | Anderson, Kenneth | .1982 |
| 'Golden Sunburst' | Yellow | - | - | Nat-Sport | Near-White | June into July | Eisel, Mervin & AHS | .1984 |
| 'Goliath' | Med-Green | - | - | Unknown | Pale-Lavender | June into July | Harrison, Dr Jamison & AHS | .1986 |
| 'Gotham' | Blue/Green | - | - | Hybrid | - | July | Petryszyn, Olga | .2009 |
| 'Grand Tetons' | Med-Green | Streaked | White | Hybrid | Pale-Lavender | July | Goodenough, Rick | --NR-- |
| 'Grand Total' | Med-Green | - | - | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .2003 |
| 'Grandeur' | Med-Green | Medial | White | Hybrid | Pale-Lavender | July into August | Elslager, Ed | .2001 |
| 'Gray Cole' | Blue/Green | - | - | Hybrid | Near-White | June | Gray and Cole Nursery & Kuk, Bob | .1985 |
| 'Gray Cole Streaked' | Blue/Green | Streaked | Yellow | Nat-Sport | Near-White | - | Fransen, Marco & Joyce | --NR-- |
| 'Great Lakes' | Blue/Green | - | - | Hybrid | Near-White | June into July | Fisher, Eunice V. | .1973 |
| 'Great Surprise' | Blue/Green | - | - | Nat-Sport | Near-White | June into July | Unknown | --NR-- |
| 'Green Acres' | Dark-Green | - | - | Unknown | Pale-Lavender | July | Geissler, Julia | .1970 |
| 'Green Angel' | Med-Green | - | - | TC Sport | Near-White | June | Klehm, Roy | .1990 |
| 'Green Bay Green and Gold' | Blue/Green | Marginal | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Green Dragonet' | Med-Green | - | - | Hybrid | Pure-White | July | Owens, Clarence | .1999 |
| 'Green Glitter' | Dark-Green | - | - | Unknown | Near-White | - | Unknown | --NR-- |
| 'Green Heron' | Blue/Green | - | - | Hybrid | - | June into July | Zilis, Mark | .2009 |
| 'Green Piecrust' | Med-Green | - | - | Hybrid | Pale-Lavender | June into July | Williams, Frances & AHS | .1986 |
| 'Green Platter' | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Fisher, Eunice V. & Ruh, Peter | .1997 |
| 'Green River' | Med-Green | - | - | Nat-Sport | Near-White | July | Wade, Van | .1999 |
| 'Green Saucer' | Med-Green | - | - | Hybrid | Near-White | June into July | Powell, Loleta | .1977 |
| 'Green Sheen' | Med-Green | - | - | Hybrid | Near-White | June into July | Aden, Paul | .1978 |
| 'Green Wedge' | Light-Green | - | - | Hybrid | Pale-Lavender | July into August | Shaw, Florence | .1976 |
| 'Green-eyed Monster' | Dark-Green | - | - | Unknown | Near-White | June into July | Simpers, Lucille | --NR-- |
| 'Grey Piecrust' | Blue/Green | - | - | Hybrid | Pale-Lavender | June into July | Donahue, Thomas & AHS | .1986 |
| 'Gullivar' | Med-Green | - | - | Hybrid | Med-Lavender | June into July | Brown, Sandy | .2008 |
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