Nursery and Christmas Tree

​Background

Oregon’s noxious weed quarantine, OAR 603-52-1200, was amended in 2009 as it pertains to butterfly bush (Buddleja davidii /variabilis). As a result, only Oregon Department of Agriculture (ODA) approved seedless butterfly bush cultivars can be propagated, transported, or sold in Oregon. ODA, in cooperation with Oregon State University (OSU), has developed a criteria and process to approve sterile cultivars of butterfly bush. Cultivars that produce less than two percent viable seeds will be placed on the ODA approved list. In some cases, enough data may already be available from creditable studies for ODA to approve the cultivar. In other cases, additional field studies may be necessary to approve the cultivar.

Cultivar approval

There are three options available to have your butterfly bush cultivar approved.

Option 1. Sterility evaluation already completed. Under this option, the candidate butterfly bush cultivar is evaluated based on a review of the results of sterility studies already conducted. The submitter should provide the results of independent research that addresses the following:

• Field studies confirming that the candidate cultivar produces less than two percent viable seeds
  
• Parentage of the candidate cultivar
  
• Ploidy level of the candidate cultivar
  

OSU specialist will conduct the review of the submitted data. The cost will be $150 per hour.

Option 2. Sterility evaluation needed. Under this option sterility is determined via grow out evaluations conducted by OSU. This evaluation process will take approximately 18 months and cost $10,000 per cultivar.

Option 3. Confirmation of interspecific hybrids. Interspecific hybrids of Buddleja are not regulated under Oregon’s Noxious Weed Quarantine (OAR 603-052-1200). However, those transporting, propagating, or selling Buddleja interspecific hybrids need to provide ODA with proof of parentage. OSU specialist will conduct the review of the submitted data. The cost will be $150 per hour.

ODA approved sterile Buddleja cultivars

The listed Buddleja cultivars produce two percent, or less, viable seed and meet Oregon's standards for sterility. The transport, propagation, and sale of the listed cultivars is approved.

• Buddleja 'Asian Moon'
  
• Buddleja 'Blue Chip'
  
• Buddleja 'Blue Chip Jr.'
  
• Buddleja 'Ice Chip' (Formerly 'White Icing')
  
• Buddleja  'Inspired Pink'
  
• Buddleja  'Pink Micro Chip'
  
• Buddleja 'Purple Haze'
  
• FLUTTERBY GRANDÉ™ Blueberry Cobbler Nectar Bush
  
• FLUTTERBY GRANDÉ™ Peach Cobbler Nectar Bush
  
• FLUTTERBY GRANDÉ™ Sweet Marmalade Nectar Bush
  
• FLUTTERBY GRANDÉ™ Tangerine Dream Nectar Bush
  
• FLUTTERBY GRANDÉ™ Vanilla Nectar Bush
  
• FLUTTERBY PETITE™ Snow White Nectar Bush
  
• FLUTTERBY™ Pink Nectar Bush
  

Non-regulated interspecific cultivars

These listed cultivars have been proven to be interspecific hybrids through testing and laboratory analysis. They are not regulated under Oregon's noxious weed quarantine and can be transported, propagated, and sold within Oregon. The fertility of these cultivars has not been assessed, though interspecific hybrids generally exhibit low fertility.  

• Buddleja 'Lilac Chip'
  
• Buddleja 'Miss Molly'
  
• Buddleja 'Miss Ruby'
  
• Buddleja 'Miss Violet'
  

Resources

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