TheConnecticut Nursery & Landscape Associationhas decide to volutnarily phase out certain cultivars ofBerberis thunbergiiover the next few year . The move comes after growing concern about the invasiveness of the mintage and a seven - yr study by the University of Connecticut . The field square off the germ count of various cultivar , and the CNLA chose to banish all but the bottom ten per centum in terms of seed product .

Here is the list of cast out cultivars :

These cultivar are approved for sales agreement and production :

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