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HELLO CVG!!!! PERCOLATION RATE IS 1-2 INCHES PER HOUR. DO YOU THINK I NEED A DRAIN? ALSO WAS WONDERING IF YOU THINK ROOT BARRIERS WORK (E.G. THOSE MADE BY "DEEP ROOT" OR "CENTURY"?) I KNOW THEY WOULD HAVE TO GO AT LEAST 30 INCHES DEEP. THIS QUESTION IS REALLY ABOUT THE NEIGHBOR'S TREES WHICH...

As you can see I am being a bit stubborn about the plantings. Trying to reach some sort of compromise. Really appreciate your advice and will try to figure out percolation. Really need to know if I need a drain or not also.

Ok I understand your concern. So to be more specific, the only trees I plan to place directly in the soil behind the walls are one Cherimoya which will be espaliered, and is known to have a weak root system, and a plumeria which is a small flowering shrub without a deep or invasive root system...

Yes, but doesn't this also vary with the tree species, the size of tree, and the way its pruned and watered?

Also is there any extra protection mat or other material I can add to back of wall that might help protect it from roots?. Also just to be clear, most of the time plants will be drip irrigated but occasionally some plants may need some hose watering. If soil percs well, can I forego any sort...

Can't I fit 20 gallon containers behind walls (they are about 20 inch wide by 20 each deep)?? They can survive on drip. What about shrubs or small trees with shallow/non-invasive roots and vegetables or perennials? I will do percolation test, but seat of my pants, soil is a loam and drains...

In a southern California backyard have two foot high mortared concrete block retaining walls with footer built 15 years ago with the goal of using them as planters but were never planted or irrigated. They are in two tiers of 50 feet long divided by steps so that there are two beds that are 30...