Thanks Boyce. I didn't know this about European Buckthorn. Off topic do you have anything about the relevant factors here?? ----- Original Message ----- From: "Boyce Tankersley" <btankers@chicagobotanic.org> To: "Pacific Bulb Society" <pbs@lists.ibiblio.org> Sent: Wednesday, March 17, 2010 10:05 AM Subject: Re: [pbs] Legacy bulbs-desirable plants or weeds > Hi Kathleen: > > Our experience at CBG strongly suggests that invasiveness is very much a > regional characteristic. For instance in the Chicago area Buckthorn is > invasive but in other regions experiencing a zone 5 climate it is not >