Tree Mob™

Next Tree Mob™

Tree Mob: What's Up with Chestnuts


1 Session: Thursday, September 27, 5:45pm
Location: Meet on Valley Road by Acc. # 24-80*A


Putnam Fellow Elizabeth (Beth) Spriggs, PhD, will speak about the phylogeny and biogeography of chestnuts. Meet on Valley Road to look at several species, learn where they are from, and how the chestnuts are related. She will explain the co-evolution of the chestnut blight (Cryphonectria parasitica) with the Asian species, its introduction to North America in the early 20th century, and the continuing effect of the blight today. At the Arnold Arboretum, Beth is conducting genomic research on the chestnuts and ashes (Castanea and Fraxinus) – iconic, but severely threatened North American trees—to inform future conservation strategies. Meet near the rockery on Valley Road at Accession 24-80*A, Castanea dentata, at 5:45 on September 27.


Parking: Park along Bussey Street (keep tires off the side walk) and enter through Bussey Street Gate. Walk on the paved road and turn left onto Valley Road, following the Tree Mob signs. 


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. Walk along Blackwell Foot Path and cross the road to South Street Gate. Walk straight ahead onto Valley Road, following the Tree Mob Signs. Allow 15 minutes.


See map of gate locations. See directions.


Free: No registration required


Tree Mobs are interactions with scientists or other specialists at the Arnold Arboretum, and provide another pathway to enjoy an... 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.