| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'National Treasure' | Miniature | Dark-Green | Marginal | White | Unknown | - | - | Goodwin, Randy | .2009 |
| 'National Velvet' | Medium | Dark-Green | - | - | Sport | Med-Lavender | August | Kuk, Bob | .1990 |
| 'Nemesis' | Medium | Dark-Green | Medial | Yellow | Unknown | - | July into August | Dupre, Dirk | .2010 |
| 'New Moon' | Large | Dark-Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Lydell, Ransom | .1995 |
| 'Night and Day' | Large | Med-Green | Marginal | White | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Ward, Jane | .2000 |
| 'Night at the Opera' | Large | Blue/Green | Marginal | Yellow | Hybrid | Near-White | June into July | Dean, Don | .2014 |
| 'Night Flight' | Medium | Blue/Green | - | - | Hybrid | Med-Lavender | August | Dean, Don | .2015 |
| 'Night Train' | Large | Blue/Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2005 |
| 'Nightfall' | Large | Blue/Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2014 |
| 'Noah's Ark' | Large | Dark-Green | - | - | Unknown | Near-White | June into July | Hatfield, Handy & Walek, Kevin | .2009 |
| 'Northern Exposure' | Giant | Blue/Green | Marginal | Greenish White | Sport | Near-White | June into July | Walters Gardens | .1997 |
| 'Nuki Girl' | Large | Blue/Green | - | - | Unknown | - | July into August | Schmidt, Bevie | .2009 |
| 'Number Nine' | Medium | Blue/Green | - | - | Unknown | - | June into July | Ragus, Gerhard & Ragus, Renate | .2015 |
| 'Nutty Professor' | Medium | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July | Klehm, Roy | .2004 |
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