| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Nagaeto' | Medium | Light-Green | - | - | Unknown | Light-Purple | - | Ruh, Peter & Ruh, Jean | .2010 .2018 |
| 'Naomi' | Small | Dark-Green | - | - | Unknown | - | July into August | Klose, Heinz & Ruh, Peter | .2006 |
| 'Nesmith Giant' | Giant | Dark-Green | - | - | Hybrid | Near-White | June | Nesmith, Elizabeth & Ruh, Peter | .1994 |
| 'No Frills' | Medium | Blue/Green | - | - | Hybrid | Near-White | July | Simpers, Lucille & Ruh, Peter | .1991 |
| 'Nokogiriyama' | Large | Dark-Green | - | - | Unknown | Pale-Lavender | July into August | Unknown & Ruh, Peter | .2006 .2018 |
| 'Nordatlantik' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Smith, Eric & Ruh, Peter | .1997 |
| 'North Pacific High' | Large | Blue/Green | - | - | Unknown | - | - | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2001 |
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