This is a living plant horizontal monumental sundial by sundial maker and designer, John Carmichael at Sundial Sculptures.  It is located at the Maryland Botanical Gardens.
<a href="//commons.wikimedia.org/wiki/User:John_Carmichael" title="User:John Carmichael">John Carmichael</a>
2002
<span class="int-own-work" lang="en">Own work</span>