Butterfly Jungle, Natural History Museum

The \'living tunnel\' made of interwoven saplings, leading to an interactive station (seen here) and the free-flight area further on.
Photo taken on the 19th of May 2009.

Traditionally this is termed a "pleached arbor." Very 19th Century (even 16th!). You don't see them very often

Zooplantman said:

Traditionally this is termed a "pleached arbor." Very 19th Century (even 16th!). You don't see them very often

Click to expand...

Chester Zoo's (cough) gardeners created one on the site of a former rose garden a couple of years ago. It hasn't taken well and the arbour is yet to fill out into a real tunnel, an issue I believe can be fairly common.