Worse case of roots we had was some sort of vine which grew roots into the above-ground concrete water tank we had. Just found gaps around the concrete lid. The vine went next day
Limb them up? Not sure what this means?
I was at least ten feet away from both the ~100 year old oaks that the pond sits underneath. What I cut out probably won't hurt the tree given how old they are. If I wanted to be REALLY safe is limb them up a bit to be sure, but these things cost $$
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Very nice What was the border going to be again?
Zebra rock maybe . May not be that waterproof unfortunately.
Just having a fun look and trying to remember some nice ones.
http://www.bespoke-gems.com/images/gemstones/rough/z2/z2a.jpg