| Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'G.W. Matthews' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Gary Jones' | Medium | Dark-Green | Marginal | White | Hybrid | - | - | Soucek, Rachel | --NR-- |
| 'Gary Rivera' | Giant | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | Zolock, Steve & Zolock, Sarah | .2006 |
| 'Gary Rolls' | Medium | Light-Green | - | - | Unknown | Med-Lavender | July into August | Zolock, Steve & Zolock, Sarah | .2006 |
| 'Gaynor Miller' | Large | Light-Green | - | - | Sport | Near-White | June | Smetana, Don & A&D Nursery | .1993 |
| 'Gene Foster' | Medium | Med-Green | Medial | Yellow | Unknown | - | - | Foster, Eugene | --NR-- |
| 'Gene Heinemann' | Large | Med-Green | Medial | Yellow | Sport | Pale-Lavender | June into July | Heinemann, Gene | --NR-- |
| 'Gene Summers' | Medium | Dark-Green | Streaked | Speckles | Hybrid | Pale-Lavender | July | Aden, Paul | .1978 |
| 'Geneva Stark' | Medium | Med-Green | Medial | White | Sport | Light-Purple | July | Purtymun, Charles & Hyslop, Jay | .1999 |
| 'Genghis Khan' | Medium | Yellow | Marginal | Yellow | Unknown | Light-Purple | July | Janssen, Bill | --NR-- |
| 'Georg Impler' | Medium | Dark-Green | - | - | Hybrid | Pale-Lavender | - | Maindok, Hans-Hennig | --NR-- |
| 'George Jay Hill' | - | - | - | - | Unknown | - | - | Seaver, Mildred | --NR-- |
| 'George M. Dallas' | Large | Dark-Green | Marginal | Yellow | Hybrid | Med-Lavender | July into August | Beilstein, Doug & Zilis, Mark | .2009 |
| 'George Smith' | Large | Yellow | Marginal | Blue-Green | Sport | Near-White | June into July | Smith, George | .1983 |
| 'Gil Jones' | Large | Blue/Green | Marginal | White | Hybrid | Near-White | June | Benedict, Dr Ralph (Herb) | .1990 |
| 'Gil Jones Streaked' | Large | Blue/Green | Streaked | Yellow | Sport | Near-White | June | Schmid, Tom | --NR-- |
| 'Ginko Craig' | Medium | Med-Green | Marginal | White | Unknown | Light-Purple | August to October | Craig, Jack & Summers, Alex | .1986 |
| 'Gladys Holly' | Medium | Med-Green | - | - | Unknown | Med-Lavender | - | Holly, Gladys & Ruh, Peter & Ruh, Jean | .2008 |
| 'Glen Ray' | Medium | Med-Green | Medial | White | Sport | Pale-Lavender | July into August | Serafin, Viktoria | --NR-- |
| 'Grace McClure' | Medium | Med-Green | Marginal | Yellow | Hybrid | Light-Purple | July | Ward, Dr Dick & Ward, Jane | .1998 |
| 'Gregory Ambrose Cleghorn' | Medium | Med-Green | - | - | Hybrid | Near-White | June into July | Chamberlain, Steve | .2006 |
| 'Gretchen Harshbarger' | Medium | Blue/Green | Marginal | Yellow | Unknown | - | - | Benedict, Dr Ralph (Herb) | .1997 |
| 'Grover Cleveland' | Large | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | Sugita, Hajime & Ruh, Peter | .2001 |
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