Mean (± SD) % canopy with winter pigment change^{a} | ||||||||
---|---|---|---|---|---|---|---|---|

2021 | 2022 | |||||||

Boxwood species | Cultivar/selection | N | 21-Feb^{b} | 02-Apr | 11-May | 23-Jul | N | 09-Mar |

Buxus balearica
| Balearic | 3 | 6.7 ± 2.9 gh | 0.0 f | 0.0 c | 0.0 c | 3 | 0.0 b |

Buxus harlandii | Richard | 4 | 1.3 ± 2.5 h | 2.5± 5.0 ef | 0.0 c | 0.0 c | 4 | 0.0 b |

Harland | 4 | 0.0 h | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Buxus microphylla
| Borderline | 4 | 0.0 h | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b |

Golden Dream | 4 | 92.5 ± 6.5 a | 2.5 ±2.9 ef | 0.0 c | 0.0 c | 4 | 0.0 b | |

Grace Hendricks Phillips | 4 | 35.0 ± 4.1 defgh | 0.0 f | 0.0 c | 0.0 c | 4 | 5.0 ± 0.0 b | |

Green Beauty | 4 | 7.5 ± 2.9 gh | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Green Pillow | 4 | 27.5 ± 2.9 efgh | 5.0 ± 0.0 def | 0.0 c | 0.0 c | 4 | 6.3 ± 2.5 ab | |

Jim Stauffer | 4 | 8.8 ± 2.5 gh | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

John Baldwin | 4 | 52.5 ± 18.9 abcdefg | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Korean | 4 | 2.5 ± 2.9 h | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Little Missy | 4 | 6.3 ± 2.5 h | 0.0 f | 0.0 c | 0.0 c | 4 | 3.8 ± 2.5 b | |

Morris Dwarf | 4 | 22.5 ± 15.0 fgh | 0.0 f | 0.0 c | 0.0 c | 4 | 5.0 ± 4.1 ab | |

Morris Midget | 4 | 20.0 ± 7.1 gh | 3.8 ± 2.5 ef | 0.0 c | 0.0 c | 4 | 10.0 ± 7.1 ab | |

Buxus semper-virens
| American | 3 | 100.0 ± 0.0 a | 98.3 ± 2.9 a | 83.3 ± 11.5 a | 88.3 ± 11.5 a | 1 | 100.0 ab |

Aurea-Pendula | 3 | 100.0 ± 0.0 a | 0.0 def | 0.0 c | 0.0 c | 3 | 0.0 ab | |

Buddy | 4 | 96.3 ± 7.5 a | 71.3 ± 25.9 b | 35.0 ± 31.9 b | 56.3 ± 40.3 b | 2 | 5.0 ± 5.0 a | |

Dee Runk | 4 | 68.8 ± 7.5 abcde | 21.3 ± 13.1 cde | 3.8 ± 4.8 c | 0.0 c | 2 | 25.0 ± 7.1 ab | |

Elegantissima | 4 | 0.0 h | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Fastigiata | 4 | 71.3 ± 7.5 abcde | 23.8 ± 11.1 cd | 11.3 ± 9.5 c | 0.0 c | 2 | 15.0 ± 21.2 ab | |

Graham Blandy | 3 | 71.7 ± 10.4 abcde | 1.7 ± 2.9 ef | 0.0 c | 0.0 c | 3 | 36.7 ± 11.5 ab | |

Justin Brouwers | 4 | 71.3 ± 42.5 abcde | 0.0 f | 0.0 c | 0.0 c | 4 | 10.0 ± 5.0 ab | |

Longwood | 3 | 100.0 ± 0.0 a | 0.0 f | 0.0 c | 0.0 c | 3 | 0.0 b | |

Piney Mountain | 4 | 43.8 ± 7.5 cdefgh | 2.5 ± 5.0 ef | 0.0 c | 0.0 c | 2 | 22.5 ± 17.7 ab | |

Rotundifolia | 4 | 15.0 ± 7.1 gh | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Tall Boy | 2 | 77.5 ± 3.5 abcdef | 10.0 ± 7.1 cdef | 0.0 c | 0.0 c | 2 | 5.0 ± 7.1 ab | |

Vardar Valley | 4 | 76.3 ± 18.0 abcd | 30.0 ± 20.0 c | 0.0 c | 0.0 c | 1 | 50.0 ab | |

Variegata | 3 | 0.0 h | 0.0 f | 0.0 c | 0.0 c | 3 | 0.0 b | |

Water Fall | 3 | 93.3 ± 5.8 ab | 5.0 ± 5.0 def | 0.0 c | 0.0 c | 3 | 5.0 ± 0.0 | |

Buxus sinica var. insularis
| Franklin’s Gem | 4 | 2.5 ± 5.0 h | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b |

Nana | 4 | 28.8 ± 36.6 efgh | 1.3 ± 2.5 f | 0.0 c | 0.0 c | 4 | 2.5 ± 5.0 b | |

Tide Hill | 3 | 28.3 ± 12.6 defgh | 1.7 ± 2.9 ef | 0.0 c | 0.0 c | 3 | 0.0 b | |

Buxus hybrid | Chicagoland Green | 4 | 38.8 ± 2.5 defgh | 0.0 f | 0.0 c | 0.0 c | 4 | 5.0 ± 0.0 ab |

Freedom | 2 | 55.0 ± 63.6 abcdefgh | 2.5 ± 3.5 def | 0.0 c | 0.0 c | 2 | 22.5 ± 10.6 ab | |

Gordo Conroe | 3 | 90.0 ± 10.0 abc | 0.0 f | 0.0 c | 0.0 c | 3 | 0.0 b | |

Green Mound | 4 | 90.0 ± 20.0 ab | 0.0 f | 0.0 c | 0.0 c | 2 | 25.0 ± 7.1 ab | |

Green Mountain | 4 | 42.5 ± 9.6 cdefg | 0.0 f | 0.0 c | 0.0 c | 4 | 0.0 b | |

Green Velvet | 3 | 100.0 ± 0.0 a | 18.3 ± 18.9 cdef | 0.0 c | 0.0 c | 1 | 50.0 ab | |

Independence | 2 | 55.0 ± 63.6 abcdefgh | 0.0 def | 0.0 c | 0.0 c | 2 | 0.0 ab | |

Nicholson | 2 | 52.5 ± 17.7 abcdefgh | 2.5 ± 3.5 def | 0.0 c | 0.0 c | 2 | 2.5 ± 3.5 ab |