Dear Lauren,
Here's a website that tells you about controlling swallowwort. I know 
that it's very difficult to eradicate in a well-established site, with 
herbiciding and replanting one of the recommended strategies, but see 
the website for a variety of suggestions.

The home site was recommended highly at the recent IPANE conference in 
Framingham, and covers many plants:

My personal experience with handpulling swallowwort was pretty 
discouraging, but there are ways to conquer it. Good luck!
Joann Hoy

On Sep 28, 2005, at 8:56 AM, Terry and Lauren Stockwell wrote:

Does anyone know the best way to get rid of black swallowwort?  There 
is a site in Boothbay Harbor with tons of the nasty plant.  The 
landowner would like to eradicate it if possible.  I think she plans to 
pull it up and then burn it.  I told her I would check if  there is a 
better recommendation.  Many thanks, Lauren