| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Giantland Athletic Cup' | Large | Dark-Green | - | - | Unknown | Near-White | June into July | Miller, Jeff | --NR-- |
| 'Giantland Golden Dome' | Giant | Light-Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Go for the Green' | Medium | Med-Green | - | - | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Going for Gold' | Large | Light-Green | Marginal | Yellow | Sport | Pale-Lavender | July | Zilis, Mark | --NR-- |
| 'Gold Cup' | Medium | Yellow | - | - | Hybrid | Near-White | June into July | Aden, Paul | .1978 |
| 'Gold Pants' | Giant | Yellow-Gold | - | - | Hybrid | Pale-Lavender | July | Beilstein, Doug & Beilstein, Mardy | .2018 |
| 'Gold Strike' | - | Yellow | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Golden Dome' | Medium | Yellow | - | - | Unknown | - | June into July | Rogers, Floyd | .2005 |
| 'Golden Gloves' | Large | Yellow | - | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .2000 |
| 'Gorgeous George' | Medium | Dark-Green | - | - | TC Sport | Light-Purple | July into August | Zilis, Mark & Ruh, Peter | .2002 |
| 'Grand Prix' | Small | Light-Green | - | - | Unknown | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Greenhead Badger Blue' | Large | Blue/Green | - | - | Hybrid | Pure-White | July into August | Finke, Chuck | .2009 |
| 'Greenhead Center Court' | Medium | Med-Green | Medial | White | Hybrid | Pure-White | June into July | Finke, Chuck | .2012 |
| 'Grey Cup Trophy' | Large | Blue/Green | - | - | Unknown | - | July into August | Vinish, Pat | .2013 |
|