Any info on damage caused to vertical retaining walls by Ficus nitida? I have not yet seen the sight, but will inspect it tomorrow. I believe trees are within 4' of wall, are kept pruned to 8-10' diameter crowns, and are in a single row adjacent to the wall. I will have more info after tomorrow. Does anyone have any knowledge of this species adjacent to a vertical wall? I know they are fairly tough on sidewalks and other horizontal surfaces. Any good research, references, etc?

Reply to post by Jan Scow, on April 09, 1998 at 00:27:56:

I have now inspected the site and found a number of pieces of info I did not have before. Trees are below the walls, not above. The walls are crib type with open faces. Plants in open faces are on drip irrigation. Soil where ficus trees are planted is poorly drained clay. Planters are less than 4' wide and are bordered on one side by concrete sidewalks and on the other by retaining walls. My guess after thorough investigation is that roots will end up shallow, under the walks, and in the face of the walls. Once there they will grow and... well you know the drill! Report is filled. Any comments? Tired of talking to myself...

Reply to post by Jan Scow, on April 09, 1998 at 00:27:56:

Keep talking, Jan. We don't mind

I'm not familiar with Ficus in the landscape. However, it is my experience that roots in general will grow hwere the conditions are right, including a long way upward. Once under the retaining walls, I think you can expect them to turn upward and follow the wall. If it is terraced, they will probably proliferate I the first terrace before growing further up. Are Ficus known for shallow rooting and sidewalk damage? If so, you might expect damage to the walls, too, depending on distance, age of trees and construction of the walls.

Russ

Reply to post by Russ Carlson, on April 16, 1998 at 01:00:54:

Thanks Russ. That gives me a whole new level of concern! I pictured them growing into the interface between the wall and the soil at grade level, but hadn't really thought about that they would (of course) go up the inside face! Good point. I don't think it changes my answer, just makes it stronger!!! And yes, they are famous for shallow rooting and sidewalk damage. I've got photos which would curl your toes! I think this one will have to be an ASCA report! Good to hear from you!
Jan

Reply to post by Jan Scow, on April 16, 1998 at 16:17:44:

>>I think this one will have to be an ASCA report!

Well, you know how to do it!