Tree Mob™

Next Tree Mob™

Tree Mob™!: Black Swallow-wort Biocontrol


Lisa Tewksbury and Lexi Johnson

1 Session: Monday, July 15, 6:00 p.m.
Location: Peters Hill, near Mendum St. Gate, Acc. # 601-2017*A


Black swallow-wort (Vincetoxicum nigrum) is a hardy European vine which sits high on the list of Massachusetts’ most disliked exotic invasive plant species. Growing in full sun to partial shade and found in all regions of the state, black swallow-wort can easily overwhelm a community of plants. The University of Rhode Island (URI) is conducting research using an insect, Hypena opulenta, to control the spread of swallow-worts and the Arnold Arboretum is participating as one of the release sites. Come hear entomologist Lisa Tewksbury and coastal fellow intern Lexi Johnson, both with URI, speak about the plant, the insect, and the use of a biological control for invasive weed management. Meet near the Mendum Street Gate on Peters Hill at Acc. # 601-2017*A (Quercus sp.) on Monday, July 15, at 6:00 p.m.

Note: Wear non-sandal, closed-toe shoes. The area includes poison ivy which has been mowed, but we still recommend that you wear enclosing footwear.


Parking: Park along Bussey Street to enter at Peters Hill Gate. Walk around Peters Hill to the Mendum Street Gate and follow signs to the gathering. Limited parking is available at the Mendum Street Gate.


Public Transportation: Take the MBTA Orange Line to Forest Hills. At the upper level of the station, cross Washington Street and go to the left to Washington Street Gate to Blackwell Footpath. Follow Blackwell Footpath to its terminus. Cross street and enter South Street Gate. Walk straight to the intersection. Turn left and walk to Bussey Street Gate. Cross the street to enter Peters Hill Gate and walk around the hill to Mendum Street Gate. Allow 20 minutes. Alternatively, from Blackwell Footpath terminus, walk left carefully along South Street to Poplar Street Gate. Walk uphill towards Mendum Street Gate.

... more »

Join us for a Tree Mob™!

What’s a Tree Mob™?

Tree Mobs are interactions with scientists or other specialists at the Arnold Arboretum, and provide another pathway to enjoy and learn in the landscape. Experts share little-known facts about our living plant collection, its relevance today, and its importance to future generations. A Tree Mob may attract a small group or a large gathering—we won’t know until it takes place. Join us in the landscape and discover something new.

What can I expect?

Plan to spend approximately 30 minutes learning about an interesting component of our collection. You can then continue your exploration of the Arnold Arboretum on your own. Tree Mobs are time, date, and location specific.

How does it work?

We will communicate about Tree Mobs by various means (see below). Using mobile technologies, such as a smartphone with location-awareness enabled, you will be able to navigate to the event location. You can also view and print a map we will provide with the day’s Tree Mob location on our website. With directions in hand, proceed to the designated meeting place to participate in our experiment for spontaneous learning.

How can I be notified?

  • Link to Tree Mob on your mobile device.
  • Sign up or manage email notification.
  • Visit our Facebook page or follow us on Twitter.
  • Keep an eye on our website.