| Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Dartmoor Forest' | Eason, Alan & Ruh, Peter & Jean | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July into August | .2005 |
| 'Dawn' | Bond, Sandra | Small | Yellow | - | - | Unknown | Light-Purple | July | .2000 |
| 'Delia' | Ford, Richard & Mary | Small | Yellow | Marginal | Green | Nat-Sport | Pale-Lavender | June into July | .1995 |
| 'Devon Blue' | Smith, Eric & Bowden, Roger and Ann | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | .1988 |
| 'Devon Cloud' | Bowden, Roger & Ann | Medium | Med-Green | Medial | Yellow | Nat-Sport | Med-Lavender | July | --NR-- |
| 'Devon Desire' | Bowden, Roger & Ann & Ruh, Peter | Giant | Med-Green | - | - | Unknown | Pale-Lavender | July | .2010 |
| 'Devon Discovery' | Goater, John & Ruh, Peter | Giant | Med-Green | - | - | Nat-Sport | Near-White | June into July | .2005 |
| 'Devon Dream' | Bowden, Roger & Ann | Small | Blue/Green | - | - | Nat-Sport | Med-Lavender | July into August | --NR-- |
| 'Devon Giant' | Bowden, Roger | Giant | Blue/Green | - | - | Hybrid | Near-White | July into August | .2019 |
| 'Devon Gold' | Bowden, Roger & Ruh, Peter | Small | Light-Green | - | - | Unknown | Light-Purple | July | .2005 |
| 'Devon Green' | Bowden, Roger & Ruh, Peter | Medium | Dark-Green | - | - | Nat-Sport | Pale-Lavender | July | .2005 |
| 'Devon Hills' | Bowden, Roger | Large | Med-Green | - | - | Hybrid | - | - | --NR-- |
| 'Devon Mist' | Bowden, Roger & Ruh, Peter | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | - | .2005 |
| 'Devon Moor' | Bowden, Roger | Medium | Med-Green | - | - | Unknown | - | - | --NR-- |
| 'Devon Red' | Bowden, Roger | Small | Med-Green | - | - | Hybrid | - | - | --NR-- |
| 'Devon Tor' | Bowden, Roger & Ruh, Peter | Giant | Med-Green | - | - | Hybrid | Light-Purple | June into July | .2005 |
| 'Devon Tot' | Bowden, Roger & Ann | Medium | Med-Green | - | - | Unknown | Med-Lavender | - | --NR-- |
| 'Diana Grenfell' | Unknown | - | Med-Green | Marginal | White | Unknown | - | - | --NR-- |
| 'Dilys' | Smith, Eric | Medium | Blue/Green | - | - | Unknown | Light-Purple | July | --NR-- |
| 'Dimple' | Chatto, Beth | Small | Blue/Green | - | - | Unknown | Pale-Lavender | July | .2002 |
| 'Dinner Jacket' | Unknown | Medium | Med-Green | Medial | Yellow | TC Sport | Pale-Lavender | July into August | --NR-- |
| 'Dorset Blue' | Smith, Eric & Aden, Paul | Small | Blue/Green | - | - | Unknown | Pale-Lavender | August | .1977 |
| 'Dorset Charm' | Smith, Eric & Ruh, Peter | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August | .1990 |
| 'Dorset Cream' | Smith, Eric | Large | Yellow | - | - | Hybrid | - | - | --NR-- |
| 'Dorset Flair' | Smith, Eric & Ruh, Peter | Medium | Blue/Green | - | - | Hybrid | Light-Purple | August to October | .1990 |
| 'Drake's Tail' | Black, Gwen | Medium | Blue/Green | - | - | Unknown | Near-White | - | --NR-- |
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