| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Gallant Heart' | Large | Blue/Green | - | - | Hybrid | Near-White | June into July | Powell, Loleta & Walek, Kevin | .2009 |
| 'Gandy Dancer' | Medium | Blue/Green | - | - | Hybrid | - | June into July | Husemann, Jim | .2016 |
| 'Geneva Remembrance' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Dean, Don | .1996 |
| 'Giantland Aftershock' | Giant | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Big Bastard' | Giant | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Blue Monday' | Giant | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Giantland Tsunami' | Giant | Blue/Green | - | - | Unknown | - | - | Miller, Jeff | --NR-- |
| 'Gold Coast' | Medium | Yellow | - | - | Unknown | Pure-White | July into August | Banyai, Pauline | .1986 |
| 'Gold Pan' | Medium | Yellow | - | - | Hybrid | Near-White | June into July | Aden, Paul | .1978 |
| 'Gold Seer' | Large | Yellow | - | - | Unknown | Pale-Lavender | July | Unknown & Zilis, Mark | .2010 |
| 'Goldbrook Glory' | Large | Dark-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | June into July | Bond, Sandra | --NR-- |
| 'Golden Dome' | Medium | Yellow | - | - | Unknown | - | June into July | Rogers, Floyd | .2005 |
| 'Golden Fantasy' | Medium | Yellow | - | - | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Golden Harmony' | Medium | Yellow | - | - | Hybrid | Near-White | July into August | King, Herb & Gladys | .2018 |
| 'Golden Maple' | Large | Yellow | - | - | Nat-Sport | Near-White | June into July | Minks, Eldren | .1980 |
| 'Golden Memories' | Large | Yellow | - | - | TC Sport | Near-White | July | Vaughn, Kevin & Walek, Kevin | .2009 |
| 'Golden Rule' | Large | Yellow | - | - | Unknown | - | July | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Gosan Sigi Grey' | Large | Blue/Green | - | - | Hybrid | - | - | Schmid, W. George | .2009 |
| 'Grandeur' | Giant | Med-Green | Medial | White | Hybrid | Pale-Lavender | July into August | Elslager, Ed | .2001 |
| 'Grandma Burns' | Medium | Dark-Green | Marginal | White | Nat-Sport | Near-White | June into July | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Gray Wolf' | Large | Blue/Green | - | - | Unknown | - | July into August | Carlson, Monty & Julie | .2013 |
| 'Great Balls of Fire' | Medium | Blue/Green | Streaked | Yellow | Nat-Sport | Near-White | July | Elchuk, Kevin & Olga | .2012 |
| 'Green Nature Lady' | Medium | Dark-Green | - | - | Hybrid | Pale-Lavender | August | Wilson, Chris | .2007 |
| 'Green Valley' | Large | Yellow | - | - | Unknown | Med-Lavender | July | Savory, Robert | .1988 |
| 'Greenie Weenie' | Medium | Yellow | - | - | Hybrid | - | June | Kuenster, Rod | .2009 |
| 'Gretchen Harshbarger' | Medium | Blue/Green | Marginal | Yellow | Unknown | - | - | Benedict, Dr Ralph (Herb) | .1997 |
| 'Groo Bloo' | Large | Blue/Green | - | - | Unknown | Near-White | June | Unknown & Zilis, Mark | .2010 |
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