The Connecticut Nursery & Landscape Association has decided to volutnarily phase out certain cultivars of Berberis thunbergii over the next few years. The move comes after growing concern about the invasiveness of the species and a seven-year study by the University of Connecticut. The study determined the seed count of various cultivars, and the CNLA chose to ban all but the bottom ten percent in terms of seed production.

Here is the list of banned cultivars:

  • 'Angel Wings'
  • 'Antares'
  • Burgundy Carousel® ('Bailtwo')
  • Cherry Bomb™ ('Monomb')
  • 'Crimson Velvet'
  • Emerald Carousel® ('Tara')
  • 'Erecta'
  • 'Gold Ring'
  • Golden Carousel® ('Bailsel')
  • 'Inermis'
  • Jade Carousel® ('Bailgreen')
  • 'Kelleris'
  • 'Kobold'
  • Lustre Green™ ('Anderson')
  • 'Marshall Upright'
  • 'Painter's Palette'
  • 'Pow Wow'
  • 'Red Rocket'
  • 'Rose Glow'
  • Ruby Carousel® ('Bailone')
  • Ruby Jewel™ 'JN Redleaf'
  • 'Silver Mile'
  • 'Sparkle'
  • Stardust™ ('JN Variegated')
  • var. atropurpurea
  • Wild type (parent species)

These cultivars are approved for sale and production:

  • 'Aurea'
  • ''Aurea Nana'
  • 'Bagatelle'
  • 'Bonanza Gold'
  • 'Concorde'
  • 'Crimson Dwarf'
  • 'Crimson Pygmy'
  • 'Crimson Ruby'
  • 'Green Pygmy'
  • 'Gold Nugget'
  • 'Golden Devine'
  • 'Helmond Pillar'
  • 'Lime Glow'
  • 'Royal Burgundy'
  • 'Royal Cloak'
  • 'Stan's Variegated'
  • 'Sunsation'
  • x mentorensis

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