| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Yellow Fever' | Medium | Yellow | - | - | Hybrid | Near-White | July | Goodwin, Randy | .2009 |
| 'Yellow Polka Dot Bikini' | Large | Dark-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Jones, Leonard | .2005 |
| 'Yellow Prize' | Small | Yellow | - | - | Hybrid | - | - | Kuenster, Rod | .2008 |
| 'Yellow Splash' | Medium | Dark-Green | Streaked | Creamy White | Hybrid | Deep-Purple | July into August | Aden, Paul | .1976 |
| 'Yikes Stripes' | Small | Blue/Green | - | - | Unknown | - | July into August | Megos, Stan | .2007 |
| 'Yojimbo' | Large | Med-Green | - | - | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .2003 |
| 'Yorick' | Large | Dark-Green | Marginal | Green | Unknown | - | July into August | Squires, Keith & Ruh, Peter & Ruh, Jean | .2005 |
| 'Yoshie' | Large | Med-Green | - | - | Unknown | Light-Purple | August | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'You Light Up My Life' | Large | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July | Elslager, Ed | .2003 |
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