OK...How to...
Seems to be a metal surround 1/8 - 3/16 x 4 " it's likelt with other verticals asross the length... to keep the sagging of the 2" x 2" wire that's across the front.. you can see it sticking over at the ends likely spot welded to the support steel.. in behind the wire they have pockets of moss and roots with internal drip irrigation [ likely ] you have to click on the first picture to see the construction I'm talking about
