| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Easter Sunday' | Medium | Light-Green | Marginal | Green | Unknown | | | Ruh, Peter | --NR-- |
| 'Eireann' | Large | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Stone, David & Ruh, Peter | .1991 |
| 'Elatior' | Giant | Blue/Green | - | - | Sport | Near-White | July into August | Maekawa, Dr Fumio & Ruh, Peter | .2002 |
| 'Elfin Power' | Small | Med-Green | Marginal | White | Unknown | Light-Purple | August to October | Ruh, Peter | .1987 |
| 'Ellen' | Small | Med-Green | - | - | Hybrid | Light-Purple | July | Stone, David & Ruh, Peter | .1987 |
| 'Ellerbroek' | Large | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Hylander, Nils & Ellerbroek, Paul & Ruh, Peter | .1996 |
| 'Ellie Bee' | Small | Yellow | - | - | Hybrid | Light-Purple | July | Springarn, Eleanor & Ruh, Peter | .1996 |
| 'Emerald Gem' | Small | Yellow | - | - | Unknown | Light-Purple | July | Stone, David & Ruh, Peter | .1991 |
| 'Emerald Isle' | Small | Med-Green | Marginal | White | Unknown | Pure-White | August | Smith, Eric & Ruh, Peter | .2008 |
| 'Endless Summer' | Medium | Light-Green | - | - | Sport | Pale-Lavender | July into August | Zilis, Mark & Ruh, Peter | .2006 |
| 'Ersatz' | Giant | Med-Green | - | - | Hybrid | Near-White | July | Ruh, Peter | .1996 |
| 'Eunice Choice' | Medium | Yellow | - | - | Unknown | Light-Purple | August | Arett, Anne & Ruh, Peter | .1988 |
| 'Eunice Fisher' | Giant | Dark-Green | - | - | Hybrid | Pale-Lavender | July | Fisher, Eunice V. & Ruh, Peter | .1985 |
| 'Euphoria' | Medium | Light-Green | - | - | Hybrid | Pale-Lavender | August to October | Zilis, Mark & Ruh, Peter | .2002 |
| 'Evening Star' | Medium | Med-Green | - | - | Unknown | Med-Lavender | August to September | Watanabe, Kenji & Ruh, Peter | .2001 |
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