| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Glacial Towers' | Large | Med-Green | Marginal | Yellow | Hybrid | - | June into July | Dean, Don | .2009 |
| 'Glen Triumph' | Giant | Blue/Green | - | - | Hybrid | - | July into August | Serafin, Viktoria | .2008 |
| 'Golden Bouquet' | Large | Med-Green | - | - | Nat-Sport | Pale-Lavender | July into August | Benedict, Dr R. (Herb) & Kuenster, Rod | .2010 |
| 'Gray Wolf' | Large | Blue/Green | - | - | Unknown | - | July into August | Carlson, Monty & Julie | .2013 |
| 'Green Milk' | Large | Med-Green | - | - | Nat-Sport | Near-White | July | Summers, Alex & Ruh, Peter | .2009 |
| 'Greenhead Golden Pineapple' | Medium | Yellow | - | - | Hybrid | - | June into July | Finke, Chuck | .2009 |
| 'Greenhead Grafton Blues' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August to September | Finke, Chuck | .2009 |
| 'Greenhead Grey's Anatomy' | Large | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Finke, Chuck | .2009 |
| 'Greenie Weenie' | Medium | Yellow | - | - | Hybrid | - | June | Kuenster, Rod | .2009 |
| 'Groovy Yellow' | Medium | Yellow | - | - | Unknown | Med-Lavender | July into August | Kruer, George | .2009 |
| 'Gunther' | Medium | Blue/Green | Streaked | Yellow | Hybrid | Near-White | July into August | Benedict, Dr R. (Herb) & Kuenster, Rod | .2010 |
| 'Gus' | Medium | Light-Green | - | - | Unknown | Light-Purple | July into August | Unknown & Ruh, Peter & Jean | .2008 .2018 |
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